Rsx Swap K20z3 help

I have a 2002 rsx base model 5 speed, I got a k20z3 wanting to swap in it. The swap came with the stock harness and the stock ecu. I was wondering if I could use the a3 harness out of my car to swap in the z3 or do I need to use the z3 harness? I was wondering because the z3 hanrness won’t hook up with the body harness inside the car.. it’ll just hook up to the stock ecu. What do I need?

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