From my understanding you cannot move devices to different organizations within DEP. If you are planning on moving the device to a different network in your Meraki account that is a whole different story (and can be easily done without enrolling the devices). From my understanding you would have to disown the the device in your DEP and then use Apple Configurator to enroll it into the other orgs DEP. Be aware that devices need to be erased and re-configured as a new device for this to work! There is a thirty day period in which the device can be removed from management. This is outline in the following video at WWDC below:
https://developer.apple.com/videos/play/wwdc2017/304/
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