Will the key from NIS 2010 work on 2011?

I have a question, I'm using NIS 2011, my subscription is getting to the end. So I was thinking about renewing my product. Today, in one of my local stores, I saw NIS 2010 on DVD, which was on half price, that means that it would be much cheaper, to buy it like that, than to get it through the internet. But I have one question, is there a renewal code inside the box, and I can just type it into my computer? Or do I need to reinstall whole program from the DVD? Also, if there is the code, is it going to work with my current NIS 2011 without any problems? Or is this the code for 2010 version only? Thanks for the answer, regards, Konrad.