I don't have an exact answer, but I would recommend checking out SizeSquirrel.com
You can create an account and add the shoes you already own (like the TC Pro) and then search fro the Genius and see what the site recommends (and how other folks who own both shoes are sizing them).
Similar to what others are saying, about 1/2 to a full size up from geniuses. I have 38.5 Genius and 39.5 TC's (all day fit). I'll be getting my next TC's in a 39.
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