Not really the "original" colors, but tailored to my own tastes/vision needs with some generally historical basis. I haven't done all of them yet, just ones that have come up so far in the couple games I've played. Only 15 thus far, plus CSs + barbarians. The predefined colors in the PlayerDefinedColors.xml are very limited, but it looks like what FXS has done is picked many of them based off of the original Civ color palettes and then combined similar ones so they could be utilized across many different Civs. I don't know the reason for this other than it simplifies the jersey system. If you set all jersey combos to the same values as the primary + secondary colors then each Civ will always have the same color palette. I believe only the primary + secondary colors are utilized for units, not the alt jersey colors. However, I forgot about the changes to the unit textures/team colors. I'll need to look and see if they update with my new palettes. Other than the loading screen, the Civ icons have all updated though. Afaik, the game can't utilize Hex shorthand, but needs the full RGB values. The Civ wiki has all the Hex values for each Civ or you can still find the RGB values in the Colors.xml, or in the various DLCs. These values still need to be used when a Civ is present in a scenario I'm assuming, for example Persia & Macedon.