I find it hard to dig out relevant info for redux in the middle of all the renoise stuff
We did make a quick-start exclusively for Redux, for this very reason
But other than that, there are very few actual differences between the two, so I personally don't believe it would be worth the effort to e.g. split up the wiki.
In fact, the only differences I can think of are:
* The additional 'sync' mode which lets Redux play synchronized to the host timeline.
* The hexagonal keyboard in Redux, providing visual feedback and making it more clear when the plugin captures keyboard presses.
* The ability for a Renoise instrument to host a plugin and send MIDI.
Other than that, they're practically identical.
On a sidenote: I think a lot of people are not aware that the MIDI implementation for Redux also applies to Renoise instruments since 3.1? Controlling e.g. the key/scale is now possible through MIDI CCs.