It would depend on some variables.  Like what is your cab now?  Is it a real arcade cab with a Jamma connector in it?  If so, then swapping in the new board and maybe adding a few extra buttons would be pretty easy.    But like BobA said, if you wanted to be able to customize it more, adding a PC and MAME instead would get you that.  But if you're not that technical swapping boards might be easier I guess.