Norton Internet Security Upgrade 2012

Hello,

 

I've got 2 diferent NIS2011 products installed in 2 diferent pc's. Can i purchase NIS2012 upgrade for 3 pc's and upgrade the 2products/2pc's?

 

If i can upgrade another question:

If 1 product has got 3days to end and the other has got 60 days how much time will i have left for each after upgrade?

 

Thanks in advance.