Just had a Michelin rep call me back and he assured me that the tires perform 99.9% the same. Both version have the same speed rating which is different from what is shown on Tireracks website.
He can't explain why one of the tires sidewall is more rounded and why one of them feels stiffer to the hand but just said as long as these tires are mounted on the same axle there is no need for concern.
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