This question comes up constantly. I used to be confused but honestly it’s extremely simple. If you have to swap your engine and want to guarantee no problems or additional modification needed, get the exact same engine from the exact same Pilot. Maybe there are some exceptions to that, but again if you want to be 100% sure, just stick with an exact swap.
I dont think you understand. Your ECU can not support the engine. It will be a very painful mistake learned the hard way.
If you install the 2wd ECU, it is not compatable with your vehicles AWD. Big can of worms.