changing NIS to Norton Security

hi everyone I have some questions.

my NIS subscription will end in several days and so I have purchased a renewal, since NIS is no longer renewable I decided to purchase 1 year subscription on Norton Security Deluxe.

I have received e-mail from Norton about link where I can download the product.

the question is: do I have to uninstall NIS before I install Norton Security?

I remember reading somewhere that if I try to install Norton Security it will just simply uninstall NIS in the process and I won't have to do anything. But is that true?

I am also concerned about how Norton Security is different program from NIS, but I heard its quite similar in term of function, that said is there any specific differences that I need to be wary of?

Lastly, since I still have several days worth of NIS subscription is it possible to add it to my Norton Security subscription? assuming they are two different product.

Thank you