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Windows 10 is EOL in October 2025
(lemmy.ml)
This is a most excellent place for technology news and articles.
Apparently there is 2 types of Windows licences. The ones that are bound to the hardware and ones that aren't. If you bought a PC with preinstalled Windows, it's probably the first and you wont get any new keys.
I think you're right that OEM licenses are more strict on certain hardware changes, as in they wouldn't give you a pass on a single mainboard change - but you would still get a key from clearinghouse. As far as I'm aware, all retail and OEM keys are hardware bound. KMS/MAK are not.