Here's a screenshot of both units, showing that they use the same model. They are the both from the pink side, with the other army using turquoise identifiers.
It's slightly different with units placed in the Editor. In the Editor, the MF Indian Archers use one colour sashes and bandana, while LF Indian Forest Tribesmen use the other colour, and there is therefore no differentiation in colour between the two different army sides opposing each other.
Anyway, I have created a new graphic skin for the LF Indian Forest Tribesmen by changing various colorations. So that means there are now four different graphics instead of two - the MF and LF archers each have different graphics, and the two army sides have different identifying colours.
I think it is only possible to use these new graphics in custom-made scenarios as the graphics for the base game are not able to be altered.
Here are some screenshots, with the line of archers being the new LF Indian Forest Tribesmen from the pink side (pink bandanas), while the units behind for comparison, are the MF Indian Archers from the turquoise army side (although, since this is from the Editor, it represents MF Archers from both army sides).
