ideally, if you have access to an EEPROM programmer, you can read out the data of each chip and compare it with the same version of the game from the MAME romset to see if they match. (since they are the same data.) if your version is older than the mame romset, just burn a whole new set and have yourself the latest (last) version.
if it does not match, you'll have to source a new replacement chip and reburn it...again mame romset is your friend.