Yeah, that's what I was thinking of but just wanted to verify.
I think those colors are due to customization variables, pulled from the ClientData for each of the 3 reward types (the quest rewards a different suit iff set depending on the faction.)
I'll check later if you can edit said client data file to change them. I know it's possible to do that with server logic ingame (using Sui color pickers, like how Composite Armor is recolored in Core3), but I don't know what server you're playing on.