I don't think it's fair to compare him to Kamran since Kamran has been performing on the international level, which is completely different from ListA, U19, First Class levels
What makes Kamran special is his ability to perform under pressure, and by the looks of the current tour, Umar has that in him too. I hope to see the two brothers play for Pakistan soon. Umar=star for the future, Kamran = current star