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They also have something in common - air-cooled flat-four boxer engine.
I guess that you have Haynes manual for GS in your literature for sure! 
Sorry, but you went into the wrong direction. I'm not engaged with Beetles. I prefer more hightech 
Our club-page: www.k70-club.de P.S. No, I don't have any Haynes-books (there was never one for the K 70). The GS-related literature, I'm owning are magazines and quartet-games, which are including both cars - which was usual for two cars from summer 1970.