Did you get the number of commits off of the network graph? I use "git log" to pull the number of commits but had no idea the GitHub web site could count the number of commits between two repositories from the most recent commit of one of the repositories.
I simply checked hykilpikonna's contributions in contributors tab which can be put in range. The exact commit difference is shown in fork project page and even has a link to a comparison page (https://github.com/hykilpikonna/hyfetch/compare/dylanaraps%3...). But don't think what you're saying can be done from the GitHub ui.
