2003 to 2000 engine change

Hello I found a low mileage 2000 intrepid with the 2.7 liter engine from a car that was in a wreck. I would like to put this in my 2003 intrepid with a dead 2.7. Someone said that 99-01 engines can be interchanged easily but I have a 2000. The first thing I noticed is that the engine harnesses are different between the cars, so I was wondering if I change the out the harness with my 2003 harness, next I trashed my flex plate so can I use flex plate and torque converter from the 2000. Would the engine still work?

You would be much better off using an engine from 02-04 as a direct plug & play.

Sorry, I probably should have updated, I have completed the swap and it was fairly easy I had to change the following items over to the 2000 engine, the coolant temp sensor, the 02 sensors, the knock sensor The engine harness, flex-plate and the cam tone ring on the left side and this can be done with removing the cam sprocket. The 2000 engine fired right up and it runs great but most of all it beats paying $1200 hundred at the junk yard for a high mileage used motor.