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The most common kitchen counter height is 36 inches, but it can vary from 30 to 45 inches. The standard kitchen sink is 8 inches deep, which means that the normal distance between a kitchen sink drain and the floor is 28 inches. This will vary, depending on the height of the counter and the depth of the sink bowl. In the bathroom, the sink drain is typically between 24 inches above the floor.
One of the contractors told me that the horizontal drain pipe coming from the wall would need to be lowered by approximately 3 to accommodate the deeper sink... not because it was too high and would contact the underside of the sink but he said it had something to do with the height above the trap.