Neo4All/AES: Is there a difference between MVS and AES roms?

Since i'm the newest guy to put this "kick-a-large-amount-of-a s s e s" emulator running, ive got some doubts here and im thanking everyone for the attention in advance:

Every game i try shows the "insert coin" message and to "put" a coin i need to hold X and then press start. The X button only works for the coin, if I press it in the midlle of the game all it will do is pausing my game as long as i hold it down... Can somene tell me what's happening?

i wouldnt really say there is a differnce because if you got a normal aes/mvs it would run both type of cartidges. and yeah i can say there is differnce because mvs run usally with arcade systems, and you can use them with anytype of emu that runs neo geo games. i think aes roms can only be used with final burn aplha (fba) but im nto an expert with neo geo though some one might just correct me, im just trying to help though.