I'm not worried about support, TBH - my Win 8.1 laptop was
never updated, because I didn't and don't trust Micro$oft, and it worked perfectly until it died.
No, I just want to know if the 8.1 drive will work in the 10 laptop, or not - supposedly they get snarky about certain hardware changes, though 11 hasn't objected to moving from a 2TB M2 SSD to a 4TB one.
(BTW, I still cringe about asking PC Specialist about upgrading, because I was used to 2.5" units and both the existing 2 TB and the new 4TB were M2 - I'd said I couldn't find the drive, not realising it was an M2 as I knew about them but hadn't used one before, and so I didn't recognise the drive
as a drive at first - but once I did, installing the new one was embarrassingly easy!)
It doesn't even object to sharing the drive with Linux Mint.
Mint, of course, couldn't care less.