For a detailed analysis about changes (diffs) that occurred between two different branches (or tags) of Semantic MediaWiki you may use the
git diff command to generate such information.
Shows the difference between 2.4.5 and 2.4.6:
git diff 2.4.5 2.4.6
git log 2.4.5 2.4.6or
git diff 2.4.5 2.4.6 --stat