You got that right. Some sets might have enabled bosses and such, but the differences are almost non-existant. Basically, encrypted sets are in one way or the other, closest match (or dead-on match) to how the roms were on the actual arcade board. You really should not worry about your e-wang, if you just care about the fact that you have every game, and not about having every single variation out there. EDIT: btw, ass isn't censored.