ΔE 12.4, fair: the same colour family, but not a straight swap. Battledress Brown is more muted than Dark Green Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Battledress Brown is more muted than Dark Green Brown.
The same difference applies the other way round: Dark Green Brown is more saturated.
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 Green Brown on the colour wheel See Battledress Brown on the colour wheel
All matches: Dark Green Brown equivalents · Battledress Brown equivalents