I can't imagine what the difference would be either unless the layout is different or some different breather. Both are the same trans model (#A340F) but believe the Toyota part #'s are different. Even Toyota couldn't tell me and said to lay them next to each other! That's a big help...
Have a 2000 Limited 4x4 w/100k and am told with the California emission standards. Had the dreaded trans cooler leak in the radiator and got the strawberry milkshake mixture. Thought I had saved it, trans dipstick is clean but when removing trans lines and then trans pan, it is coated inside...