Reseller accounts and domain switchover

Hi there,

This question is aimed at the web devs who may have some experience working with reseller accounts. Basically here is the senario:

I have 2 hosting packages in operation at the moment with the same reseller.

1. One is currently handling the domain: mydomian.com

Its name servers are below:

ns3.h365.com -> 1.1.1.1
ns2.h365.com -> 1.1.1.1
ns1.h365.com -> 1.1.1.1

2. The second is currently a stop-gap domain on which a new website is being developed.

Its name servers are below:

ns1.h365.com -> 1.1.1.2
ns2.h365.com -> 1.1.1.2
ns3.h365.com -> 1.1.1.2

What I wish to do is have the second package take over hosting of the domain mydomian.com. Am I correct in assuming:

By setting up the new domain on package 2, along with all the e-mail address etc, I can then turn off package 1 and package 2 will serve mydomian.com?

Thanx in advance....

Justin