No, Marth's Fsmash has remained the exact same through all the Melee versions. The only changes made to Marth were done in the PAL version.i know they changed marths fsmash ...from 1.0 to the later versions. kind of a shame when you dunno which version your playing on at first.
And if I want to use Zelda for "important" matches in Melee, I check the version with a quick disc eject which does not harm the game's session. Or I just stick with Peach/Sheik and forget about that whole mess.