Logic Board Compatibility MacBook Air A1466

Hi, I have a mid-2013 Macbook Air A1466 with the lower powered processor (i5 1.3Ghz) and only 4GB of RAM. The Macbook is in good order but I would like to upgrade to 8GB of RAM by swapping out the logic board.

I'm seeing conflicting accounts of logic board compatibility across this model range. Some sellers on eBay suggest that you can use any A1466 board on any A1466 machine. Another says that the board nos. have to match. Mine is an 820-3437-A.

Does anyone know which is correct please?