Two instalations together and after that older one switch off


I have a supervized implementation of HA on my proxmox NUC. I would like to transfer all setting to another container using hasos What is the best way to do that? Last step will be transfer my duckdns domain on my router to new IP of new container, but what steps are necessary before? All my devices uses one MQTT broker and zigbee. Can I configure new MQTT as the old one for ex.?