1995 993 Pirelli N2 vs N3

Vehicle Information: Model: 993; Year: 1995; Body Type: Cabriolet; Total Mileage: 24000;

I have seen a few references to excessive rear wear on my model. I get about 5000-6500 per rear set. Car is not driven hard, most of mileage is within city. Is that typical?I currently have the Pirelli P-Zero Direz N2 front and Rosso N3 on rear. Is N3 on rear OK with N2 on front or should I have put Assim N2 on rear.Thanks again for the expert advice.