activate Windows 8.1 with windows 8 key

[hassie54]

last year i buy a upgrade of windows 8 pro.
Now i have a dvd of windows 8.1 pro but no activation key.
Can i use the activation key from my upgrade?

 

[theog]

http://www.eightforums.com/installa...retail-windows-8-1-windows-8-product-key.html