Matching tires on front and back?
 

I have a 1999 Boxster and needed two new tires on the rear. I ended up getting the Continental ContiSport Contact2. Apparently on the front I have the Continental Conti Sport Contact. There is a different tread pattern. Do you all think that I am going to have any performance or handling issues?

Fronts are 225/40-18

Rears are 265/35-18

Your thoughts are appreciated!