I note that the directions call for XF-51, otherwise known as Khaki Drab (I remember a discussion of this color way back). This is different from the base color for the Char B1 Bis from the same era (and company). Printing error, or the colors were really different? Both are green colors.

The French did indeed have different greens. For Renualt UE's Olive green would be appropriate (Hataka HTK-A094 Vert Olive). The B1 Bis used Vert Fonce.