I bought a lot of 10-12 GM door handles on eBay a long time ago. They were all similar, but varied slightly in back angle where it fits against the door, and slight difference in
cross section shape of the handle grip. I had one which came with my unrestored car, so I assume it was an original, but the handle felt uncomfortably thin to me. So I picked out two that I liked the feel of, to have rechromed. (Paul's if anyone is interested) As for the thumb button, they're stainless, and varied only in the length of the pin. Again, I picked out the best ones, and modified the pin length. (had to make it longer)
I know that doesn't answer your question about commonality between Camaro and Nova, but I thought it might help you expand your search, especially if you can see them before purchasing.
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