Same fictional characters (with same actors) appearing in unrelated movies

Was not this

"The two homeless guys given money by Eddie Murphy's Prince Akeem in Coming to America are the Duke brothers (Don Ameche and Ralph Bellamy), who were conned out of their fortune by a different Murphy character in Trading Places."


also a "cinematic in-joke" much like the Sheen and Patrick appearances in HotShots2 and Wayne's World ?

I don't see the difference as all three were basically cameo appearances for comedic character recognition effect.