Between AC and non-AC, I would expect the AC to have more cooling capacity and maybe some provision for mounting the condenser. Otherwise they should probably swap without any problems, especially if you aren't using the AC.
Between Wildcat and Riviera, you may have mounting issues because they are different bodies. This doesn't mean you can't mount it, but you won't know until you try. Back when I was younger and wilder, I installed a 61 Tempest radiator in a 67 Rambler American and it worked fine. When I sold the Rambler, the buyer didn't even notice the wrong radiator, and believe me, it looked very wrong.
Ray
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