is there different 4l60e's

I went to get a trans from a guy today that said he had a 4l60e. It looked like the same trans as the one I have, it had the round plug for the wiring but it did not have the bolt holes for the trans module. What is the difference, can anyone tell me?

How about what year your's is vs what you are getting, critical info left out here.

I have a 96 new body style Chevy light duty 3/4 ton van. I think that is where my problem is, I need to get a 97 or newer trans because my van was made right when they where changing from the old body style to the new.

yes there are many different ones, i found this out the hard way because when we went to find a good used 4L60E for a 97 extended cab all the yards said this was the only year and model for this 4L60E in particular so we had to have it rebuilt for 1100 bucks