There are lots of things that make it hard to compare. first, girls have a higher pain tolerance. second, if you're going through puberty the chest is more tender. third the balls are lower down and more vulnerable to hard kicks and stuff like that. fourth, you can't compare it to what you don't have. fifth, if you've recently given birth, it will hurt much more (my mom didn't get a pump from the nurse, she was in pain and crying when nothing was being done to her chest). if my mom were to be kicked i guarantee that would hurt at least as much as being kicked in the balls, prob more (since no pressure hurt). So being hit in the chest normally does not hurt as much as being hit in the balls, based on what i know. Maybe something to compare it to would be cramps? Although cramps in my opinion is a different sort of pain it's a stabbing feeling down there from the inside of the body, vs balls is outside of the body, but both affect the abdomen.