Is there a difference between a players choice version and an original version other than the case? What exactly is the difference between the two that makes the code work in one and not the other?
The GameCube Action Replay has a different master code for SF Adventures v1.0 and v1.1, therefore, they are treated by the AR as two different games. So there is a different set of cheat codes for each game (the cheats themselves are identical, but the numbers behind them are not).
From a player's perspective there should be no difference between the two versions...
Just a guess, but the only difference between the two versions could be the date they were compiled/assembled. Yet, the two versions require a completely different set of AR codes...
The other possibility is that they made minor bug fixes, but that's unlikely.
jrose0555 posted the codes for both versions, but I don't think the v1.0 codes work at all. I don't know anything about how AR codes are made other than that they probably require major hex editing skills, so I'm unsure if it will ever be possible to create a working 1.0 version of the code.
I wish they would publish the version numbers on the discs themselves or in the game credits. The only hints we have to version differences are the "Player's Choice" labels.
There were two versions of Star Fox 64 as well, one of them (the rarer one, I'm not sure if it was 1.0 or 1.1) allows you to get over 511 hits. The only way to tell the difference (other than testing the 511 limit) is to find out if it's a "Player's Choice" edition or not.