major problem with harness

[mizuboi]

okay so i finished puting together my wiring harness and i go to connect it to the ecu and it does not fit i'm using the japanese harness but i made it longer to reach but now i find that it doesn't even fit in my ecu umm is there a difference between japanese ecu and an american ecu? and do i need to get a japanese ecu to make things work? this is bad if someone could help me quickly that would be great!