Q's about repacing motherboard. Newer model? Different carrier?

So i recently hard bricked my h810 g4. (backstory post #2)

I was looking into replacing just the motherboard. I came across some cheap ones for t-moblile. Which would be nice because thats the service i use plus they are more rootable. Even it i get a blocked one, If i can get it to boot up i can sell it for parts with proof that it actually works.

Is it possible to swap the motherboard with one from a different carrier?

Also my phone was a beta phone. Serial starts with 503, so im wondering if i can even replace it with another h810.

Any advice would help.

Thanks