ΔE 9.9, close: similar, with a visible difference side by side. Drab Brown is a little lighter, warmer than Dark Battle Dress.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Drab Brown is a little lighter, warmer than Dark Battle Dress.
The same difference applies the other way round: Dark Battle Dress is a little darker, cooler.
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 Battle Dress on the colour wheel See Drab Brown on the colour wheel
All matches: Dark Battle Dress equivalents · Drab Brown equivalents