Already searched, h-t, hswap a bunch of sites, but i still have some questions because of how the car is swapped right now so heres my question.

I have a 95 DX civic hb with a 94 b18b in it. Now i have the opportunity to pick up a 99 GSR swap that's in a full front clip. My question is, what do i need to do with the wiring? I dont mind going all obd2 and swapping the harness if it makes it all easier, but im looking for your opinion on what would be best? Ive never seen a car swapped from DX to LS, to GSR. And the obd dfferences have me pondering whats the best way to go ?

Thanks in advance