C7 -> C8 pro migration, Murphy was MIA

My understanding was that things that connect to your device via the cloud GUID would need to be updated. For instance, my Geofency App is accessed via a cloud endpoint. Won't I need to update all my iOS devices to use the cloud endpoint/GUID associated to the new device? Or was that the way it used to be with C5->C7? I assumed you couldn't migrate a device GUID, otherwise, the old device would need to know how to get a new GUID if re-pruposed or sold. Sorry, planning C7 -> C8 Pro this weekend and planning to try this out. I'll probably chicken out because everything is working fine.

EDIT: Nevermind, I see it listed here under other cloud integrations