Foreing logic board will work?

I have a Galaxy Note 5 N920G that has a water problem, everything just fine apart that it does not recognize the sim, so for calls and data is useless. I took it to Samsung , and they said that the motherboard or logic board does not work and need a replacement, but they want to charge me 300 usd that´s like a brand new note 5. Anyways browsing through eBay there are some boards but with different prefixes such as N920 A, V, T, N etc. I wonder if it will function with my cellphone? Will it be easy to replace the board?

Also im from Mexico if that helps.