Odb2 not responding to scanners no start diesel plus it only tries to turn over in neutral?

Okay, if the replacement engine is a 03 it shouldn't be compatibility. I didn't see any tach bounce while you were cranking it. When you turn the key on do the gauges do anything?
If not, then I suspect we are going to need to verify the powers and grounds to the ECU and the dash as a starting point.
Attached are the powers and grounds that feed the ECU. I would check the fusible link that feeds the power to it and make sure it is there.

I would first check the fuse #51 in the TIPM for power in the left rear of the engine compartment.

This guide will show you how:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If there is no power, I would replace the TIPM which is easy to do because it-self learns. Here is how that is done in the images below. Please let us know what happens.

I have also seen the cluster cause this issue as well. Can you please check the fuse #51 for power?