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If you were able to get the (proprietary, no doubt) chemical names for these materials, I suspect they would all be at least very similar, even if only tweaked a little in the polymer structure; all being in the polycarbonate family. This is a polymer chemist's $.02 worth.
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Tennifer, Melonite, and similar finishes have nothing to do with polycarbonates nor polymer finishes. They are hot salt nitriding processes. There are dozens of sources on this that you can Google- here's one:
Melonite vs Tenifer on semi-auto pistol slides