Do I have to re install Windows 7 Ultimate Retail Version over the current version of Windows 7 Ultimate OEM "Trial"?

I have an old PC which worked fine with Windows XP on it. I wanted to continue to consider using it with Windows 7 (instead of buying a new machine).

So my friend gave me a copy of the version of Windows 7 Ultimate (OEM) to try to see if the machine was worth keeping (i.e. good performance with my critical apps loaded on this subject).  Using this version, I was able to switch from Windows XP to Windows 7 using a clean installation. I have re-installed critical applications to check performance with the new operating system.  I was impressed (and happy) so I decided to purchase a licensed copy of Windows 7 Ultimate. I finally found a great offer and bought a copy of Windows 7 Ultimate (Full/Retail - not OEM) with the required activation key via the Internet (to be delivered next week).

My question is: since I now have the version of Windows 7 Ultimate (OEM) already installed on my machine, I will have to perform another clean installation when my Windows 7 Ultimate retail version coming? I would really not all over again. I would like to simply enter the Activation Code of the version of Windows 7 Ultimate (Full-detail) when it arrives. What is the best way to reach my goal?

http://Windows.Microsoft.com/en-GB/Windows/help/genuine/product-key#T1=tab01

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