My analysis is based on doors & windshields*...essentially underlying chassis architecture. If they are the same (993 doors & windshield will fit 964 and vice-versa), the underlying car is fundamentally the same. This is demonstrable by the fact that you can backdate a 993 just as Singer does with 964s. I realize the 993 is quite a bit of a jump from the 964, but they didn't redesign the entire platform like they did between the 993 & 996, and 997 & 991.

*The Boxster sort of breaks this argument, but only because the front half of the car is literally a 996 with different suspension.

Last edited: Feb 23, 2018