Basically, the themes have evolved. The dark scheme and light scheme share the same highlight palette as the original themes except for maybe background color s and tweaks to non highlight colors. I also have made cosmetic changes to things like python triple quote and other things, some things that only work with my personal language file edits (but they don’t adversely affect the default languages). I also added colors for some of my plugins etc. Though the highlight palette may be the same, not all the elements are guaranteed to highlight like the original Tomorrow schemes.
So in short, there are a number of differences, but none that change the overall feel of the schemes. Basically, I needed to include some kind of scheme with the themes, so I pulled from what I use. I haven’t used light themes in a while, so I did have to update the light theme to use the changes the dark version uses.