A friend of mine got the 'Canadian' Hockey game that the source code says uses the same ROM as Soccer. But comparing a video of Soccer on YT to a video of him playing the Hockey game, there is at least one significant difference: The music played when you make a goal is very different. So I'm guessing it's actually a slightly different ROM than the Soccer game (unless there happens to be two different versions of Soccer, which could be possible...)
Are the differences on the ROMs indicated by the 3-character code after 'MM4799 C' of the die label? (NCX, NDC, etc).
Do we still need to get these variations in hand? I can start looking specifically for these to get them taken care of... The alternate Basketball too, he has the '15 minute' one, so it definitely exists...