i think you will find that they are the same internally. some shift related devices on the side of the tranny are probably different. they can be interchanged.

i put an auto from a 240 into a 280e that i got really cheap with a bad tranny. it works fine except it thinks the redline of the 280 is about 4,000 rpm and so shifts then. it is a little odd but works acceptably for cheap wheels.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.