I think you'll be fine with mismatched tires with similar characteristics. I ran bridgestone pp s04 in front and bridgestone re760's on the rear and I didn't wreck or die. I really didn't even notice the difference, the car still handled its business on the twisties. I even drove home 30 miles in one of the worst snow/ice storms DFW has ever seen and lived to tell about it.
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