I tried that. As mentioned, DHP says my Camaro ECM is an unsupported file type when I read it. If I continue anyway and save it, it becomes a goofy locked file. If I plug in the Century ECM and try to write the Camaro file into it I get this.Read your car's with DHP. That should be the only file you care about saving and writing. Not sure what's getting lost in translation.
This is why I was trying to trick HP into thinking my Century ECM was the Camaro's. I'm starting to think that isn't possible with the tools I have.