I would like to add a new NS entry for a couple more of my site,

I am aloted 6 ip's

The server itself is configured ns1.blah.com 1.2.3.4 and ns2.blah.com 1.2.3.5

Now I would like to run a few other sites on ns1.different.com 1.2.3.6 and ns2.different.com 1.2.3.7

Now my question is does this only require me to change the NS entries for the domain in Edit a DNS Zone? and change the domain host at the registrar for the domain to 2 ips that are not being used.

And is there anything special that needs to be done in c-panel?