I... don't see those as either. Continuing canon is a GREAT term for them, may I just say?
Take Star Trek. TOS, TAS, TNG, DS9, and VOY are explicitly one universe. (Supposedly, ENT is as well, but there's some continuity issues there that make me less willing to accept it.) I would consider them all one universe, with the same rules, and continuity across the board.
One example I can think of where continuing canons might be considered as a fusion for me would be anyone writing Knot's Landing fic that referenced Bobby Ewing being alive and well, because they'd be borrowing a continuity change from their parent show that the writers of KL decided not to use.
AKA, it all gets really muddy when different execs have their hands on the branded pieces of the franchises.
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Take Star Trek. TOS, TAS, TNG, DS9, and VOY are explicitly one universe. (Supposedly, ENT is as well, but there's some continuity issues there that make me less willing to accept it.) I would consider them all one universe, with the same rules, and continuity across the board.
One example I can think of where continuing canons might be considered as a fusion for me would be anyone writing Knot's Landing fic that referenced Bobby Ewing being alive and well, because they'd be borrowing a continuity change from their parent show that the writers of KL decided not to use.
AKA, it all gets really muddy when different execs have their hands on the branded pieces of the franchises.