transfer working motherboard to identical phone. Possible?

Hi, thanks for the reply, really appreciate you taking the time out. Unfortunately I had no joy. Managed to get hold of an identical phone, UK SIM Free carrier unlocked model, powered it up and tested everything, all worked fine. Swapped motherboards and neither phone powered on. Put the motherboards back in their original phones and the new one powered on again, everything worked. So either both the motherboard and power circuit are bad on the waterlogged phone, or more needs to be swapped than the motherboard to get a new phone to recognise it. I'm at the limits of my abilities. I'm handy enough with swapping components, but I've got no testing ability and I don't know enough about the phone to know if I needed to swap more over to get it to work. Looks like I've lost the data on the flash storage unless I go down the road of a professional data recovery service, which in the UK would cost about £700. Nonetheless, thanks again for taking the time to try and help me out.