Yes, all configurations will be reset when removing the device from one network to move it to another one.
You should be able to create a template from the device before moving it, and then assign the template to be allowed on the network you're moving it to.
Edit- It's been awhile since I've moved MS devices (never moved an MX), so I can't remember what settings didn't move, but it wasn't like a full wipe of the device.