Best to assume Microsoft does not want you to go backwards and your key will be locked to w11
Windows 11
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There literally isn't a difference between a license key for Windows 10 and Windows 11 (maybe things are different in Enterprise licensing, but definitely not for Windows Home and Pro) If Windows 10 is activated on your PC, you can install either without issue.
There are VERY few usecases that warrant upgrading from W10 to W11 at this particular point in time. Unless there is some feature that is not available on W10 which is also worth it (honestly can't think of a single one) I'd just wait until at the very least end of life support for W10 ends.
For me it was the look of 10. I just don’t like it. However, I did have to do a ton of disabling crap in 11 to get it to a minimalistic state. So much ad and copilot garbage to turn off. So much.