Will 2011 NIS Product Key renew subscription for 2014 NIS?

I'm ready to buy a 2011 NIS product key at a cheap price, but does anyone know if this (older) unused 2011 key will be fully accepted/recognized by NIS 2014 for renewal of a 1-yr subscription?

I don't know how far back (old) unused NIS product keys can be used to renew the subscriptions for newer versions of NIS, such as for NIS 2014.