What is the difference is between NIS and Norton Security

Hi

Can someone tell me what the difference is between these two items or are they the same?

I am currently using NIS without any problems and have recently upgraded to Windows 10 without issue

My Subscription is due to expire next month and the only thing I can find in the shop is Norton Security which now covers upto 10 Machines.

I know I can renew NIS online directly but just wondered if the other is better to use or can I use the code for Morton Security in my current NIS?