Ghost Touching Error after replacing Game Cart Board

Hi All, my son accidently dropped his Switch in the toilet (Dont ask me how and there was no contaminents in that toilet at the time, thank god).

I took the switch apart looking for water damage, cleaned it up etc and the game cart was quite corroded inside and on the outside which i suspected was an issue. Instead of attempting to clean it i changed it.

However after this now i am getting the ghost touch issue, before it was intermittant but then started behaving, now its just all the time.

I did read that there is a V1 V2 compatibility issue and that it is possible that if its a v2 switch and i put a v1 board in it could cause this issue. How can i tell the difference between the game cart boards for V1 or V2.

I believe the switch is a V2 as it has the QR code on the ribbon cable connecting to the board.

Is there any thing to look out for so i can check the one i have as a replacement and if its wrong i can then order the right one.

Cheers in advance.