Migrating between 2 AD namespaces

[paddhu]

Hi All,
I need to migrate partial public folders and all My Folders from one POC server (10.1.1) to another UAT server (10.2.1) (physically different server).
I am not worried about the upgrade piece of the process, but more on security migration.

Both the servers use the same AD provider for security.
However, the issue is the namespace ID is different in both servers' Cognos Configuration.

POC server :
Namespace Name: ABC
Namespace ID : ABC_AD
Host & server : XYZ.org

UAT server :
Namespace Name: BCD
Namespace ID : BCD_AD
Host & server : XYZ.org

I read that the CAMID is <Namespace_ID>:<AuthProvidedID>. I realize the <AuthProvidedID> is not going change in the above scenario, as both are the same AD servers. However will the change in Namespace ID affect the My Folders' migration. How best to overcome this?