Windows 10: Activate Windows 10 Pro OEM with retiring Windows 10 Pro Retail product key

My PC is running a valid install of Windows 10 Pro retail but the system HDD is failing.I have acquired a SSD with Windows 10 Pro OEM installed. I would like to retire the HDD containing the retail licence and substitute it with the SSD containing the OEM licence. I do not wish to reinstall the retail version on the SSD as that would delete all the apps thereon. Can I activate the OEM version with the retired retail version's product key? The oem version was not originally installed on this pc and hence the motherboard is not the same as per the original oem install.It does not matter th

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Should I buy Windows 10 Home or Pro?

I bought a win 10 pro oem key for £25, changed my motherboard and cpu, and reinstalled windows, and it activated automatically. So I would say why not buy pro?

From here-
https://softwaregeeks.co.uk/product/windows-10-pro/

Was near enough instant delivery of key by email, and it activated on my original install, and on a clean install with changed hardware. Can't say fairer than that for £25

 

Windows 10 pro

I need to change my motherboard, have windows 10 pro. When i google how to it says go to activation then add an account, my issue is there is no add an account option under activation? Or am I in the wrong window?



Not sure how to proceed, ive googled it and the same results. Do I have an OEM or? On the disk sleave it says OEI DVD?
The COA says windows 10 pro for OEM software

 

Should I buy Windows 10 Home or Pro?

This online store looks cheap. You don't want to know how much OEM keys or other software prices are in my country. lol