ΔE 7.6, close: similar, with a visible difference side by side. Brown 3606 is a little darker, warmer than Dark Battle Dress.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Brown 3606 is a little darker, warmer than Dark Battle Dress.
The same difference applies the other way round: Dark Battle Dress is a little lighter, 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 Brown 3606 on the colour wheel
All matches: Dark Battle Dress equivalents · Brown 3606 equivalents