I would count yellow version as the same game as the originals, the only difference was that you started with pikachu and you could get charmander bulbasaur and squirtle throught the game, and you had the ability to teach pikachu surf... its the same storyline, the same encounters the same graphics (except for pikachu) I mean its in essence the same game. (I played them read and yellow to completion) just to trade with myself :P)
as for crystal or emerald I didnt get to play them
to put it in perspective
Pokemon yellow is more alike red green blue versions, then mario 64 ds is to mario 64, or the other gba releases of super mario...










