Quite correct - Come Back is indeed only from the American vinyl release “Connections and Disconnections” while Funk-A-Disco is from the European and Asian vinyl release “42,9” and, unfortunately, the CD reissue “Who’s A Funkadelic?” mistitles “Funk-A-Disco” as “Come Back”, completely confusing the buyer.
What would have made much more sense would have been to have simply put out a new CD version with both songs on it, making for a complete release.
But, for the record, here is the Facebook link that I said I would put up for “Funk-A-Disco”:
https://www.facebook.com/EddieHazelandtheParliamentFunkadelicThang/videos/505254673368131/