There are 4 versions I've run into. The original long board 10 mhz version that was on Final Fight and others, the short 10 mhz version which was on The World Warrior and others, the Dash 12 mhz version that was on Champion Edition onward, and the Qsound board, but that is really "CPS1.5". World Warrior used the short 10 mhz version but you can use the long board, 10 mhz or a Dash 12 mhz with it and they will all run it the same speed afaik. If the game can't make use of the 2 mhz increase then it won't just run faster. But if you run Champion Edition onward on the older 10 mhz short board, they will run slower than they should. The old long board is generally compatible going forward but I've run into games it won't work on, and I think there are some really early games like the original Final Fight release that require it.
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