Activate NIS 2010 from second subscription?

Hi -

 

I have two NIS 2010 3PC subscriptions. One with 3 activations is about to expire in 6 days. The other, with two remaining activations, is good until November.

 

Can I use the remaining 2 November-expiring activations to reactivate the two that are going to expire next week? If so, do I have to uninstall and reinstall, or is there a way of entering the later expiring product key without reinstalling?

 

thanks!