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There are four pieces to these cases too; polycarbonate front and frame, screen protector frame, polycarbonate back frame, and outer silicone skin. The only difference between the two I tested was the outer silicone skin color.
The screen protector frame sets on the front and then the front frame piece attaches directly to it and fits snugly on the iPad 2. In other cases the screen protector piece is part of the front frame.
There are openings along the plastic frame for all ports, cameras, and other parts. The slits you see in the plastic are where the silicone outer shell attaches.