I don't seem to have a computer nanny on my 993 messing with my brakes or throttle. I have a cable connecting accelerator pedal to the throttle body on the engine, same as RS America (964). I have hydraulic brake master cylinder with ABS, same as 964 RS America. Electric power windows, same as .... [guess].
Tell us the differences between the two models in the M64 engine. For bonus points, list 2 or 3 features from the 993 engine that many 964 owners install.
But, the 993 is newer, and therefore more "high tech", and therefore "watered down".