Can I swap working motherboard from old phone to another used phone?

Hello,

I have a Samsung s6 G920F (bought from Australia) that I opened up carelessly and damaged the lcd and optimizer screen. I found another model exactly the same on ebay but it is from the UK and was wondering if it is possible to swap the motherboard (working) from my old phone (because I would like to retrieve my old data with sentimental pictures) in to the used phone?

Also does it matter that the new phone is network locked if i change the motherboard, does it mean that it would no longer be locked to the carrier?

TIA