No you can't legally install it with the same key.
Yes you can install it with the same key.
I installed a copy of Windows 10 Pro using a generic/temporary licence key from Microsoft and bought a licence key for Windows 10 Pro shortly afterwards, but I left the placeholder key to see how long it would be until it asked for the proper key... Just out of curiosity... It has been months and it still says licensed, and I still have the proper key just sitting here in my drawer...
Microsoft's licencing and security isn't the greatest!
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