OK, by “body exchange” are we meaning 1) two people switch bodies, or 2) one person changes sex (non-surgically) or 3) a person turns into something else, or 4) reincarnation, or all of the above? Because A Florida Enchantment would not qualify under meaning 1 which is how I would define a body exchange. Neither would Switch, Heaven Can Wait (nor the original, Waiting for Mr Jordan nor the Chris Rock remake), All of Me nor the Shaggy Dog movies. I haven’t read or seen any version of Conn Yankee in King Arthur’s Court but isn’t that more of a fantasy time-travel story as opposed to a “body swap” or “uni-body swap” (whatever that means; how can a single body be “swapped”?).