One must also consider the noticeable variation in actual tire size when compared to claimed industry size ratings. Having looked at numerous tires in the 32mm - 40mm sizes now I've discovered quite a variety of actual sizes when mounted on the same size rim.
I've got a set of 37mm Contis that are shorter and narrower than a Kenda 35mm mounted on the same rim.
Seems the industry standards, or at least the manufacturer's interpretation of the same, are somewhat flexible.