So you are running two independent Zigbee networks, one with a Conbee and Deconz and another coordinator with ZHA and you want to move devices from the Deconz-managed network to the ZHA-network?
I have removed both network and deleted both integrations
I also had to manually delete the zigbee.db file in order to instal the ZHA integration again
Thank you - this was the solution that worked for me
I had uninstalled the Deconz integration, but not the Deconz addon which was why I still had many Zigbee devices associated with both the ZHA (new) and Deconz (former) integrations