Have no idea whether or not it is a Bab5 homage. My guess is that it is simply the normal range of shades of hide along a spectrum, just like humans have a range of skin colors along a spectrum, even on a single world.
The Bab5 Drazi purple and greens had nothing to do with skin color, but rather with affiliations associated with a cultural event (somewhat reminiscent of the rivalry between the reds, whites, blues and greens under the early Byzantine Empire: https://en.wikipedia.org/wiki/Nika_riots ).