Physical attributes are weight and height. Athletic attributes are power, speed, quickness and skill (bat to ball, repeating delivery, etc.). There is a difference between physical attributes and athletic attributes.
No Hart being tall and Wiemer being tall had nothing to do with the comparison. It is the comparison of the athletic attributes like speed, power, arm strength and others which matches Wiemer very closely. When you look at a young Jenkins there is a lot of comparison between him and Wiemer. What side of the plate one hits from is irrelevant when looking at their athletic attributes.