Switching to a new Ad server


We have an AD synchronisation project  with a target AD server

We want to switch to a new AD server which is not in the same domain. 

Let's say server 1 : test.ad1

and server2  : test.ad2

We have populated server 2 same datas as server1 but  we don't have the same OUs etc.

We want to set up a synchro project with the server 2.

How should we do that ? should we update all the objects in DB with the new OUs (in AdSAcount for example etc) Or 

Is the new synchro project going to update all the datas that for us ?