Thanks. I tried registering on mamecheat.co.uk, but it gave an error and didn't register me so I couldn't log in and comment about this topic. Searching online I found this about ffrevng10:
https://github.com/mamedev/mame/issues/7314
So maybe that will fix parent/clone relationship eventually and the parent will get cheats as well. Cheats for this game were apparently created in Feb. 2015 and the newer version of FFR was added in Nov. 2015. The clone is very hard to find online since the newer version became the parent in 0.168. FFR is a lame game and runs very slowly anyway like some other stv.cpp games, but the cheat to see Zombie Belger dancing to Thriller makes it all worth it.