I think any pick up in speed won't be from simply switching from continental to Michelin, but to a tire design that is 5 years newer. Michelin has been evolving their customer tires all along. Quotes from Daytona lead me to believe that continental has been selling a formula from at least as old as 2013.
It won't be 5 seconds a lap faster, but it'll be enough to notice. I imagine race pace will stay roughly the same, but the faster qualifiers will see some improvement. In my uneducated "I've seen a stack of tires" opinion.
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