Well that’s quick. This long awaited flow im/exporter works for both types:
(thanks for sharing @SunBeech !)
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Copy / move devices is not possible.
But when you restore a backup, you in fact “copy or move” (some) devices, just delete devices you don’t want afterwards, on both Homeys.
It depends a bit if you have an empty Homey to work with or not, because everything will be restored from backups.
Note
when z-wave or zigbee is involved, never run a second Homey at the same time, until you made sure there’s no duplicate z-wave/zigbee devices left.
(This includes Matter-over-Thread)