The height of the boys isn’t any different but the one on the left is definitely more broad. With him being so broad he can’t really fit normal Ken clothes except the shoes. The petite girl is of course shorter than the average sized Barbie (doll on the left is a tall sized), but just so happen to be the same height as my Rapunzel. Petite’s body is smaller than a normal Barbie’s so the clothes would be a little loose but I’m sure you could find something easily to fit her nice vs the broader Ken. He will probably need clothes that are for those 1/6 scale dolls that are pretty husky~