Will a 1996 ford ranger motor fit in a 2001 fordranger

Depends on the actual engine. Is it a 4-cyl or 6-cyl and do the trucks have the same transmission?

Same trans 4 cyl

Will a 1996 4.0 motor and transmission fit in my 2000 ford ranger with a 3.0 motor

Any time you are installing a different size engine, there will be all kinds of problems. Starting with the motor mounts, exhaust system, Engine Control module, wiring harness, emissions, transmission, etc, etc, etc. This will be an expensive project.

Same 3.0 and 5 speed trans