I'm not aware of them being different. You may want to check with another glass shop and get another opinion. Sometimes there is a difference in the tint, or even in the area that is tinted, or in the mask (the area near the rear view mirror with a bunch of tiny dots as well as the same sort of pattern around the windshield). May times there are such differences without there being any difference in the glass fit and often the later better one is less expensive.
