Well on my RyZen Biostar build that is exactly what I did and Microsoft Activated the Win 10 OS with the new build. Basically a motherboard,memory, cpu changeout. I had to go to my Microsoft account for that machine to activate it on the updated system. Which was good since it was a Win 10 Pro license that spanned from Win 7 OEM Home ($79), Win 8 Pro ($49), Win 8.1 Pro (Free) to Win 10 Pro (Free). In that case I was rather happy with Microsoft. It had no issue with booting up and finding the drivers. I subsequently reinstalled Windows 10 once activated as a note.
Then one will need to wipe the drive, buy another license for Windows, load all the programs etc. I would just recommend creating an account first if one did not have one so it will be easy to keep your OS intact with all the programs/settings involved.when you have the microsoft account linked to the license, yes, there's no issue, but I know most people here just doesn't use that option so I always prefer to assume the no usage of that feature which personally I also use.
So I've finally decided to give up my Phenom II and go Ryzen.
Can I be lazy and just put in the old SSD into the new mobo?
I really don't want to do a reinstall of everything.
I will though if there will be great benefit!
I honestly don't get how people are to lazy to do a full reinstall of windows. It takes at most 30 mins and you don't even have to baby sit it.