If using the ZHA integration then there is no problems migrating as long as you first have upgraded ConBee firmware and a backup is done so you can restore if needed to go back → https://www.home-assistant.io/integrations/zha/#migrating-to-a-new-zigbee-coordinator-adapter-inside-zha
But you know that you should at least use a long USB cable for any Zigbee Coordinator or you should not be suprised if you get wierd and intermittent delivery errors or latency problems as well as battery drainage on devices due to EMF interference which force messages to be resent many times, (and the ConBee uses and older radio chip thah is known to be more susceptible than newer radio chips in new adapters), again you really need to read this → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage
Adding a few dedicated Zigbee Router devices would make that less noticable, and the more Zigbee Router devices the better, however it is still highly recommend to take actions to avoid interference.
At least you will be a aware.