Is a 545FRE the same gear ratios for all applications? Can I take a Ram transmission mated w/ a 5.7 hemi & put it in a Cherokee w/ a 4.7?

Also, is it the same transmission for 4WD and can it be used interchangeably with RWD?
I've got a good transmission sitting in the garage and seeing what I can put it in if I buy a vehicle with a bad one.

It is a pretty interesting transmission from an engineering standpoint.
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