all cps1 games will run on 10mhz or 12mhz. 12mhz improves performance slighlty on same games amd was the standard for sf2ce, sf2hf, pang 3 (and i think one other game?). It is the safe bet for all games. If theres something to it, i'm interested to know more.
To determine what oscillator your board has, the easiest way is to look at it. It is around the middle of the A board and is clearly labeled. It is a metal rectangular component and will say 10 mhz or 12 mhz right on it
For those asking these questions, there are dedicated threads on this forum.