If you update your set there isn't really any reason to update LB the data that LB uses for MAME is outdated I believe like 174 or 175 so any newly working games in MAME won't get imported anyway since LB won't recognize them as working. If you come across a game that isn't working that used to work due to the ROM name changing just go and edit the game and change it to the new rom name. If you don't overwrite your old set in the same folder you will have to use the feature in LB to change the ROMs location to the new folder for LB to find the ROMs.