What is Vista Pro? For what I could find, there's no such edition. Starter, Home Basic, Home Premium, Business, Enterprise, Ultimate were what I could find.
Rather than swapping CPU's, I'd reinstall the 10 to the 64 bit version and add RAM to that supposing the HP is the Convertible MiniTower version. Vista will be obsolete within a couple of month anyway which means the issues it has will never get fixed. W10 has its issues, too, but they're hopefully improving the functionality alongside with the telemetry gadgets.