My friend Ed got two new fronts on his 987.1 Cayman S and he accidentally got a different tire on the front, same brand but different model, and took it to the track and said it was virtually undrivable anywhere near the limit. But the ride to/from and around town was fine. He has already ordered two new tires.
Around town you would probably be ok. But like H.B. says, who wants to drive like that
