Im most cases there are no more registration keys with Windows 10, it's rather a digital license. Activation/license is validated in one of two ways:
-- linked to your PC hardware (when you change MoBo this wouldn't work)
-- linked to your Microsoft Account - when changing motherboard you'd want to follow this path.
So then, the steps to transfer your license are:
1) Boot with the old hard drive, the activated Windows 10.
2) Link your activated Windows to your Microsoft account
3) Boot into your new Windows, and activate by logging into your Microsoft account. You don't have to enter a license key.
4) Optionally, choose to log into windows with a local account instead of MS account, after activation is successful.
There are many resources on the net about it, but essentially it boils down to the above steps.
https://support.microsoft.com/en-us/...d-fb3fc72b6665
There may be an exception if you purchased a retail copy of Windows 10 and have a Windows 10 registration key, but it doesn't apply to your case. Most licenses are digital and you have to follow the above.
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