If all your doing is track-days and your not trying to beat the track lap record, yes.... just remember these are DOT racing tires, they are nothing like the Pilot Power, they take AT LEAST 2 laps to warm up from full cold, and will have a completely different profile then the Pilot Power, they are very lean hungry tires! Also Michelins racing tires are known for amazing grip yet little feedback, each tire company makes the tires different, you just need to find the ones that suit you best!
PR1 and PR2 front tires are the same tire, just diff compound, the PR1 is the softest for example, I run really soft tires during the colder months, and Medium during the summer.