The mobos should be the same for all machines.
Yes - the ROMS are removable. The board will run 3 different Pac-Man games (Regular, Ms., and Pac-Man Plus)
As long as it says "Midway Mfg. Co." on it, and all the ROMS are labeled pacman or ms. pacman, you should be okay. The ROMS on the board may still even still be labeled for Pac-Man or Ms. Pac-Man by a paper sticker or printing on the chips, themselves
This is a regular, genuine Pac-Man mobo - this should help you know what you're looking for (It's only one board, this is just a front and back picture). DON'T buy a board unless the 2 smaller boards are included. If those aren't included, the game wont run, and they tend to fall of easily. But fortunately, they're cheap to replace with brand new ones. $50, tops, for both. Better yet, the new versions of those chips tend to stay in place, better than the originals.