Yes but why have different colours if the just mean the same?
P113 of the core rules, different colours correspond to different ways of rolling for events.
Borderland: roll twice, choose highest.
Wild lands: roll once.
Dark lands: roll twice, choose lowest.
With these rolls, plus 1D to events on roads and -1D to events in hard terrain you can get a lot of variety and interesting decisions in route making without needing nots of fiddly rules.
Hope this helps.