Is it possible to replace iphone 8 logic board with iphone 8 plus logic board?

[iMore Question]

Hello,
I recently bought a second-hand iphone 8 64gb and with two months of regular usage its SIM signal stopped working properly. I can't make or receive calls and 4G doesn't work most of the time either.
I took it to a repair center and while reading the iphone's serial number through a MAC software they told me the logic board had been replaced with an iphone 8 plus logic board, because the serial was different. Is it really possible? What could have happened here?

 

[Just_Me_D]

I don’t know. You can try contacting Apple Support or iFixit Online and make an inquiry. In the meantime, if a member can answer your question, hopefully he or she will reply soon.

 

[Golfdriver97]

My first counter-question would be are they different sizes? The next question would be if the hardware can be mixed and matched; my guess is no.

 

[Mars20]

Have you considered contacting the seller?

 

[Lee_Bo]

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