Built new computer, running unactivated Win10 Home, have Win7 Pro key

I was initially thinking of buying a Win10 Home key, but I realized I still have a Win7 Pro key I purchased that I have never upgraded to Win10 and is not currently in use.

Two questions

• Can I use the Win7 key to activate Win10 (or is that no longer an option)
• Will Win10 Home turn into Win10 Pro (assuming I can still use key)

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