If it is going to a "brand new" organisation then contact Meraki support and say you want to do an "org split". They can move the devices, licences and associated config in one hit for you. Note this can not go into an existing org. The process creates a brand new org.
Otherwise as said, you need to unclaim and reclaim the APs. You must be an adminstrator of both orgs. Then you pen a case with Meraki support and request to transfer specific licences.