They shared a lot more than that. In Europe, the 914/4 was sold as a VW-Porsche 914. The 914/6 was sold as a Porsche.
http://en.wikipedia.org/wiki/Porsche_914
And you’d be surprised at the ability to fit 914/VW components into Corvairs.
I spent high school putting foreign engines into Corvairs.
Even put a Corvette 327/350 into the ass of a Corvair.