New vCenter not an Upgrade? so I am guessing you deployed a new one with new DB?
linked clones or full clones?
Linked clones you'd do a recompose having added the new vCenter into the servers via View Admin but the problem is that the ESX hosts will need to be moved to the new vCenter to do the recompose however this will mean you are unable to delete the existing ones and remove the replica which would have to be done manually.
if it is a manual pool then shouldn't be an issue once you have added the vC to View admin.
give us some more details about what you have already and what you want to achieve.
