I haven't tried either, but I can that one problem is that it's a lot easier to fill in holes (say, the dent) in fiberglass than it is to create them. The dent is a lot more detailed than people realize, so if you want it to be accurate, and you're modding it onto a Jango helmet, just be careful.
Also, I believe there is a difference in the positions of the right ear cap (with the rangefinder). Maybe someone can vouch for me and post pictures.