The bell housing is between the engine and the transmission.
A Jeep Cherokee had a AW 4. A six cylinder Grand Cherokee had a 42 re. An eight cylinder had a 45rfe.
If it is gray, then yes.
The engine holds six quarts.
If same engine, yes.
there should be a fuse box under the hood
Some do, some don't. If it does you can see it at the rear bumper.