Haha, I´ve seen how PAL uses r29, but NTSC-U and NTSC-J r28.
NTSC-U
[spoiler]80684768: 2C030002 cmpwi r3,2
8068476C: 40820010 bne- 0x8068477c
80684770: 38000003 li r0,3
80684774: 981400B9 stb r0,185(r20)
80684778: 48000418 b 0x80684b90
8068477C: 809801B8 lwz r4,440(r24)
80684780: 7F03C378 mr r3,r24
80684784: 48010151 bl 0x806948d4
80684788: 809801AC lwz r4,428(r24)
8068478C: 7C7D1B78 mr r29,r3
80684790: 839801BC lwz r28,444(r24)
80684794: 39E00000 li r15,0
80684798: 80040010 lwz r0,16(r4)
8068479C: 2C000000 cmpwi r0,0
806847A0: 41820010 beq- 0x806847b0
806847A4: 39E00001 li r15,1
806847A8: 3BA00029 li r29,41
806847AC: 4800008C b 0x80684838
806847B0: 2C030029 cmpwi r3,41
806847B4: 41820080 beq- 0x80684834
806847B8: 40800080 bge- 0x80684838
806847BC: 2C030003 cmpwi r3,3
806847C0: 41820008 beq- 0x806847c8
806847C4: 48000074 b 0x80684838
806847C8: 801801B4 lwz r0,436(r24)
806847CC: 2C000000 cmpwi r0,0
806847D0: 41820068 beq- 0x80684838
806847D4: 809801DC lwz r4,476(r24)
806847D8: 2C040000 cmpwi r4,0
806847DC: 4180005C blt- 0x80684838
806847E0: 3C60805A lis r3,-32678
806847E4: 38A10058 addi r5,r1,88
806847E8: 80630040 lwz r3,64(r3)
806847EC: 4B9A665D bl 0x8002ae48
806847F0: 88010090 lbz r0,144(r1)
806847F4: 7C000775 extsb. r0,r0
806847F8: 40820028 bne- 0x80684820
806847FC: 80010094 lwz r0,148(r1)
80684800: 80610098 lwz r3,152(r1)
80684804: 5400103A rlwinm r0,r0,2,0,29
80684808: 8081005C lwz r4,92(r1)
8068480C: 7C03002E lwzx r0,r3,r0
80684810: 7C800039 and. r0,r4,r0
80684814: 4182000C beq- 0x80684820
80684818: 38000001 li r0,1
8068481C: 48000008 b 0x80684824
80684820: 38000000 li r0,0
80684824: 2C000000 cmpwi r0,0
80684828: 41820010 beq- 0x80684838
8068482C: 3BA00004 li r29,4
80684830: 48000008 b 0x80684838
80684834: 39E00001 li r15,1
80684838: 2C0F0000 cmpwi r15,0
8068483C: 9BB3000A stb r29,10(r19)
80684840: 41820100 beq- 0x80684940
80684844: 83B80410 lwz r29,1040(r24)
80684848: 39E10020 addi r15,r1,32
8068484C: 83980414 lwz r28,1044(r24)
80684850: 3A010010 addi r16,r1,16
80684854: 3B200000 li r25,0
[/spoiler]
NTSC-J
[spoiler]806842C8: 2C030002 cmpwi r3,2
806842CC: 40820010 bne- 0x806842dc
806842D0: 38000003 li r0,3
806842D4: 981400B9 stb r0,185(r20)
806842D8: 48000418 b 0x806846f0
806842DC: 809801B8 lwz r4,440(r24)
806842E0: 7F03C378 mr r3,r24
806842E4: 48010151 bl 0x80694434
806842E8: 809801AC lwz r4,428(r24)
806842EC: 7C7D1B78 mr r29,r3
806842F0: 839801BC lwz r28,444(r24)
806842F4: 39E00000 li r15,0
806842F8: 80040010 lwz r0,16(r4)
806842FC: 2C000000 cmpwi r0,0
80684300: 41820010 beq- 0x80684310
80684304: 39E00001 li r15,1
80684308: 3BA00029 li r29,41
8068430C: 4800008C b 0x80684398
80684310: 2C030029 cmpwi r3,41
80684314: 41820080 beq- 0x80684394
80684318: 40800080 bge- 0x80684398
8068431C: 2C030003 cmpwi r3,3
80684320: 41820008 beq- 0x80684328
80684324: 48000074 b 0x80684398
80684328: 801801B4 lwz r0,436(r24)
8068432C: 2C000000 cmpwi r0,0
80684330: 41820068 beq- 0x80684398
80684334: 809801DC lwz r4,476(r24)
80684338: 2C040000 cmpwi r4,0
8068433C: 4180005C blt- 0x80684398
80684340: 3C60805A lis r3,-32678
80684344: 38A10058 addi r5,r1,88
80684348: 8063FBC8 lwz r3,-1080(r3)
8068434C: 4B9A6AFD bl 0x8002ae48
80684350: 88010090 lbz r0,144(r1)
80684354: 7C000775 extsb. r0,r0
80684358: 40820028 bne- 0x80684380
8068435C: 80010094 lwz r0,148(r1)
80684360: 80610098 lwz r3,152(r1)
80684364: 5400103A rlwinm r0,r0,2,0,29
80684368: 8081005C lwz r4,92(r1)
8068436C: 7C03002E lwzx r0,r3,r0
80684370: 7C800039 and. r0,r4,r0
80684374: 4182000C beq- 0x80684380
80684378: 38000001 li r0,1
8068437C: 48000008 b 0x80684384
80684380: 38000000 li r0,0
80684384: 2C000000 cmpwi r0,0
80684388: 41820010 beq- 0x80684398
8068438C: 3BA00004 li r29,4
80684390: 48000008 b 0x80684398
80684394: 39E00001 li r15,1
80684398: 2C0F0000 cmpwi r15,0
8068439C: 9BB3000A stb r29,10(r19)
806843A0: 41820100 beq- 0x806844a0
806843A4: 83B80410 lwz r29,1040(r24)
806843A8: 39E10020 addi r15,r1,32
806843AC: 83980414 lwz r28,1044(r24)
806843B0: 3A010010 addi r16,r1,16
806843B4: 3B200000 li r25,0
[/spoiler]
PAL
[spoiler]8067BF68: 2C000002 cmpwi r0,2
8067BF6C: 40820010 bne- 0x8067bf7c
8067BF70: 38000003 li r0,3
8067BF74: 981600B9 stb r0,185(r22)
8067BF78: 48000424 b 0x8067c39c
8067BF7C: 809801B8 lwz r4,440(r24)
8067BF80: 7F03C378 mr r3,r24
8067BF84: 48010181 bl 0x8068c104
8067BF88: 809801AC lwz r4,428(r24)
8067BF8C: 7C7E1B78 mr r30,r3
8067BF90: 83B801BC lwz r29,444(r24)
8067BF94: 39E00000 li r15,0
8067BF98: 80040010 lwz r0,16(r4)
8067BF9C: 2C000000 cmpwi r0,0
8067BFA0: 41820010 beq- 0x8067bfb0
8067BFA4: 39E00001 li r15,1
8067BFA8: 3BC00029 li r30,41
8067BFAC: 4800008C b 0x8067c038
8067BFB0: 2C030029 cmpwi r3,41
8067BFB4: 41820080 beq- 0x8067c034
8067BFB8: 40800080 bge- 0x8067c038
8067BFBC: 2C030003 cmpwi r3,3
8067BFC0: 41820008 beq- 0x8067bfc8
8067BFC4: 48000074 b 0x8067c038
8067BFC8: 801801B4 lwz r0,436(r24)
8067BFCC: 2C000000 cmpwi r0,0
8067BFD0: 41820068 beq- 0x8067c038
8067BFD4: 809801DC lwz r4,476(r24)
8067BFD8: 2C040000 cmpwi r4,0
8067BFDC: 4180005C blt- 0x8067c038
8067BFE0: 3C60805A lis r3,-32678
8067BFE4: 38A10058 addi r5,r1,88
8067BFE8: 80631E08 lwz r3,7688(r3)
8067BFEC: 4B9AEE05 bl 0x8002adf0
8067BFF0: 88010090 lbz r0,144(r1)
8067BFF4: 7C000775 extsb. r0,r0
8067BFF8: 40820028 bne- 0x8067c020
8067BFFC: 80010094 lwz r0,148(r1)
8067C000: 8061009C lwz r3,156(r1)
8067C004: 5400103A rlwinm r0,r0,2,0,29
8067C008: 8081005C lwz r4,92(r1)
8067C00C: 7C03002E lwzx r0,r3,r0
8067C010: 7C800039 and. r0,r4,r0
8067C014: 4182000C beq- 0x8067c020
8067C018: 38000001 li r0,1
8067C01C: 48000008 b 0x8067c024
8067C020: 38000000 li r0,0
8067C024: 2C000000 cmpwi r0,0
8067C028: 41820010 beq- 0x8067c038
8067C02C: 3BC00004 li r30,4
8067C030: 48000008 b 0x8067c038
8067C034: 39E00001 li r15,1
8067C038: 2C0F0000 cmpwi r15,0
8067C03C: 9BD5000A stb r30,10(r21)
8067C040: 41820114 beq- 0x8067c154
8067C044: 83D80410 lwz r30,1040(r24)
8067C048: 39E10020 addi r15,r1,32
8067C04C: 83B80414 lwz r29,1044(r24)
8067C050: 3A010010 addi r16,r1,16
8067C054: 3B200000 li r25,0
[/spoiler]
What do you think about it? This is probably one of the very rare moments in which I´ve seen a game using different registers compared to the other region(s). I remember happening something like this on my berries code for Poképark Wii 2.
Tales of Symphonia: Dawn of the New World is the same way. The PAL version is actually different in a few ways, it has some new items and stuffs. It's very hard to port DotNW codes between regions because registers change, instruction order changes, and I think in some cases the way calculations are performed change as well; I was unable to port my 99.99 Grade code to PAL.
Not really new to me. Even rlwinm instructions are almost different.