are the roms that i use on my pc compatible with the xbox versions emulators?

For the most part, yes. If the game runs on the emulator (on the PC) that the Xbox version is ported from, then it will run on the Xbox. The only exceptions that I can think of, is MAMEoX, where some games (Strikers 1945III, Street Fighter 1, etc.) might be too large to squeeze into the Xbox's RAM, or Kawa-X, where some of games need to be decrypted (Metal Slug 3, King of Fighters 2K, etc.) in order to play.

Speaking of Strikers 1945 III....

Strikers 1945 I is only 12 megs and Strikers 1945 II is 37 megs. Shoul these 2 games not function on MameOX or is it a driver issue?

Strikers 1945 III is around 6 megs so it is to big for Mameox's current release, but I can not understand why the first 2 do not work.

Anyone have any idea or a tech lesson for me