In USDAA, the heights are 12-16-22-26. So no, not the same percent difference, and as I already described, the potential variance between dog's height and jump height is, percentage wise, at it's greatest for the 22" height. Which I don't think is fair. It may not be an issue for me, but that still won't make it really fair. I don't have a good workable solution for it while sticking with the USDAA philosophy of not having dogs jump under their shoulder height (my best guess would be to add a height and change them to 10-14-18-22-26, with the cutoff for 18" being 17", cutoff for 14" being 13.5", and cutoff for 10 being 10", but that's a big change, would require a lot of equipment modification, and I doubt they'd go for it), but fortunately, it's not my problem to solve.