From the Buzzrplus+ account on Facebook:
--
Fremantle Media released/published/debuted/licensed 100 episodes of five classic game shows available for Amazon Prime members to stream, free. The five shows are Match Game '75 and Family Feud (1980), along with Card Sharks (1978), Tattletales (1974), and Press Your Luck (1984)
--
Not sure about the rest of the episodes, but there are 19 episodes of "Family Feud" on Prime and the first episode listed ("episode 61") was not one that was already on Nosey.