Also, it's not always the case that both sides are the same. they may look the same but may have one or two polys done differently depending on the mesh. Whenever you have exploding geometry, it usually means that somewhere along the way your model's verts got re-numbered from the way they originally were. The count will be the same but the positions will all be wrong. Exporting the OBJ from Poser might change vertex order. This happens alot when you weld seams during export from Poser. Also the order may change on import to your modeler of choice.