M and F are definitely still on Stop. It's not a case like In and Out Of Love where they basically smother M and F with the Andantes. Plus M and F made the song iconic by singing and promoting it.

Yeah Any Girl is sort of a shame but it's situation where they took a Kim Weston tune and just wiped the lead and dropped Diana's on top of the existing track, which included the backgrounds. quite a few other times, they did wipe the backgrounds too and added M and F. at least until you get into the later years.