Please check the following article for migrating hosts from one vCenter to another. Point to note here is vCenter can manage Esxi(s) from different sites but make sure the network latency between sites are very minimal otherwise vCenter may lose connectivity to Esxi on remote site and hosts will disconnect from vCenter intermittently.
https://knowledge.broadcom.com/external/article/312551/how-to-move-esxiesx-host-from-one-vcente.html