We have 4 SLES 10 SP3 servers with ZCM 10.3.1 installed and have since upgraded all 4 servers to ZCM 11.2
When initially building the first server we used the following TID to generate the external certificate.
Cool Solutions: AppNote: Installing ZENworks 10 Configuration Management using External Certificates

The first server was installed into the zone and given the external sql details and the certtificate details etc.
Thereafter the remaining primary servers were installed referring to 1st primary server for each primary server install.

I now need to replace the initial 1st primary server as I am installing on SLES 11sp1.
As the 1st primary referred to the external CA, can I just install a new server and refer to the initial primary server when I install
and then once the new server is in, update the closest server rules to point to the newly installed primary server and then remove the old one after a few days.