Chosen Solution

I dropped my iPhone 7 Plus in water and its logic board I totally destroyed but rest everything is working. I’m getting cheap iPhone 7. I was wondering if I could replace 7plus logic board with 7. Since i’m having hard time getting iPhone 7 plus logic board. Thanks in advance

The logic boards are different sizes but even if they were similar, they are driving a very different rear camera and as such, the connectors would not be compatible.

I thought iPhone 7 / 7 plus were waterproof?