Windows 10: Windows 10 product key different than the one in my hand

I am getting ready to change my motherboard and CPU. I have a physical Windows 10 USB that I used to re-install Windows 10 about a 2 years ago. I just looked at the product key Windows 10 is telling me I have an it's my old OEM key that came with the computer years ago.When I look it says my Windows 10 is activated with a digital license connected to this account. I am afraid when I change motherboards Windows is going to tell me I don't have an active license because it seems this account is tied to that original OEM product key and not the one I bought at Best Buy and used to install Window

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Windows 10 product keys and activation - and the KMS angle

Changing the product key to the generic Windows 10 product key will reset activation to the standard retail channel for activation. It might just activate (if there was a previous digital license for Windows 10 for that computer established with Microsoft). Once Windows 10 is back on the retail activation channel, then more than likely changing the product key to the Windows 8 product key using the same method may work.

 

windows 10 key

Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?

 

Windows 10 Prod key shows different

I have installed windows 10 pro on newly installed pc, I purchased a key while back i used an app called prodkey to find what the prod key is so i could use the same key for new pc. however when i activate with key that i bought Prod key reports it as a different key all together *Confused I guess im little confused on this as well with how it handles License keys like it is activated but not - lot different than Win7. Does windows 10 actually require a key after a fresh install, the step where it asks to put in product key I skipped that step as i would do it later but when i go to System in control panel it says Windows is activated huh? so i selected change product key and put in the key i purchased not sure why the app prod key shows a totally different prod key from C:\windows.