911 997 Cf Series suspension to PASM comfort

Hi I have been playing with the idea of buying a 997 for a long time… On my wish list the PASM is at the top, because I heard that the car is very comfortable with it. Since I have back problems, I therefore put a lot of value on it! Since I have unfortunately found that the car can not have a sunroof (I am 193cm tall), the search is not easy…. I have now found 2 cars, which are however further away and thus a test drive a little heavy he is….. A front mopf and a rear-mopf model. So my question: Is there a great difference in comfort between series suspension and PASM in comfort mode? Was there anything changed during the model maintenance on the chassis? Other damper characteristic? Thank you