In article , M.L.
wrote:

You won't need MagicalJellyBean either. The Microsoft
server already knows who you are, and what license key
it is. By generating the key during your previous
Windows 10 Home upgrade, you're now all set. Your
previous Win10 install, laid the groundwork for this
install to be "easy as pie".

How will Microsoft know who I am? Will I need to enter my Microsoft
username and password first?

entitlements, and no. swap the drive and don't worry about it.

https://support.microsoft.com/en-us/help/12440/windows-10-activation