ΔE 6.8, close: similar, with a visible difference side by side. Khaki Brown is a little darker, more muted than Deep Khaki Drill.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Khaki Brown is a little darker, more muted than Deep Khaki Drill.
The same difference applies the other way round: Deep Khaki Drill is a little lighter, 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 Deep Khaki Drill on the colour wheel See Khaki Brown on the colour wheel
All matches: Deep Khaki Drill equivalents · Khaki Brown equivalents