There are some very minor changes, but this got me thinking about tricky fonts are compared to software development in general. You can fork a font on GitHub and make some changes, but you can't really merge them back into the original font because fonts are expected to be entirely static. Perhaps they could accept pull requests for a DejaVu 2 or something.
Interesting. I hadn't thought of that before, but those examples seem to embody the struggle in the transition from classic print design to modern digital mediums.
I imagine someday we'll see more typefaces versioned like software, instead of alterations receiving new names. Or is this already happening?