What is the difference between edited and unedited?
I don't think I know either, but X Collection maybe?
Oh, I think that the X Collection used streamed audio instead of sequenced midi. When the game switches between the music samples, it stops for a second before playing the next song (similar to the Complete Works series). Maybe there are more things, like different saving options (password & memory card) and fade-in/fade-out thingies.
The whole game, along with X2, was reprogrammed so it could interact with the menu selection and unlockable features in the X Collection. Remember that the games was going to have voice samples (and re-recorded voices for the PS1 X games), but Inafune said no because he wanted them to be used in the Maverick Hunter X series. ^^;
One more thing. There exist two versions of "Rockman X (J)" and "Mega Man X (U)". They are 1.0 and 1.1. 1.0 was an early build where it couldn't save your progress after you beat a stage, so you got sent to the Central Highway again. 1.1 lets you play the game without any problems. In some SNES hardware and early SNES emulators, 1.0 had this glitch where you got sent back to the intro stage, but new versions of the emulators fixed that. I even had an actual "Rockman X (J)" cartridge that had this exact problem. I sold it, and kept the newer version. ^^;
Roll's in-between leg sprites are probably unshaved in this one. 
You mean ZeRoll?