Question about wiring harness difference during motor swap 3.2L
 

So, I have a 2003 Isuzu Rodeo 3.2L Automatic w/ four wheel drive.

The motor I went and got is for a 2003 Rodeo Automatic w/o four wheel drive.

The wiring harness was left on the motor which I thought would make things
easier, but on my motor that's coming out, I have one LARGE main engine wiring harness and on the other one I have four small connectors.

Any idea what this difference is? Is there an easier way to deal with it
other than swapping the whole harness over?