ΔE 11.2, fair: the same colour family, but not a straight swap. Traitor Green is a little lighter, more saturated, cooler than Dark Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Traitor Green is a little lighter, more saturated, cooler than Dark Drab.
The same difference applies the other way round: Dark Drab is a little darker, more muted, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Dark Drab on the colour wheel See Traitor Green on the colour wheel
All matches: Dark Drab equivalents · Traitor Green equivalents