Renew NIS 2011 subscription

Hi, my 2011 product subscription runs out in approximately
30 days.

 

If I purchase another retail version of NIS 2011 could I
use the product key to renew my subscription for my current NIS product?

 

As I think for the moment I would prefer to stay with
v2011 (decide over next couple of weeks).

 

Thanks for your advice.