I understand I can run a git command locally to see them in the terminal, but I want to see them visually on github. Is this possibly?
I want to be able to see the diff between two commits, NOT two branches.
Yes - you can compare two commits via the compare
UI:
https://github.com/orgname/reponame/compare/<hash1>...<hash2>
You can find the hash values by visiting the Commits
tab and copying the commit hash for each commit you're interested in.