From what I can see, there are only small differences to the torso itself. The details on the back and on the chest are "floating details" rather than constructed in. The biggest differences are the various permutations that are included with the model. It would be, in my opinion, a pretty time consuming unfold if you do all of the permutations with the main torso. But it is a very good file never-the-less. Props to FS once again.