Injector wiring Q? SR20

[Pstl_pete]

I am in the process of upgrading my SARD 550cc injectors with Nismo 740cc injectors. The only problem being is that the SARD injector clips are different than the stock SR20 ones that the Nismos require. I have my old KA harness and have cut the clips from there but now I am confused as to how to wire them up. There is a significantly larger and thicker wire on each injector clip and I have matched it up the the thicker SR harness wire.

I am wondering if I were to screw up the wiring job ie. - reverse the wires will the injectors still work properly? I really dont have any way of telling which color wire should go where therefore no way of knowing if I had done the wiring properly.

Thanks