The easiest way to ensure continuity if it is the same instance is to do an "Update Connection" from Options -> Monitor Setup. That way, you can track the change in performance profiles before and after the upgrade to new HW.
I think you left the old instance in there, but just switched the licensing to the new instance on new HW. If it hasn't been a long time, go ahead and switch licensing back to the original instance and run through the update connection wizard to "repoint" DPA. Then you will still have reports PLUS a before and after picture of performance. See how the new server/HW impacted end users.
Worked like a charm!