i work at an arcade. My boss wants to upgrade his existing Dance Dance Revolution (USA Ver.). Unfortunately, I recently learned that this game in particular cannot be upgraded, only DDR 3rd Mix and up can be upgraded. My question is: can a DDR 3rd mix or a more recent version PCB work in the DDR (USA ver.)cabinet? I was told that this cannot be done, i would have to buy a whole new game. Can someone verify this? Thanks in advance