Deep Khaki Drill vs Walnut

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Walnut is a little darker, warmer than Deep Khaki Drill.

Can I use Walnut instead of Deep Khaki Drill?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Walnut is a little darker, warmer than Deep Khaki Drill.

Can I use Deep Khaki Drill instead of Walnut?

The same difference applies the other way round: Deep Khaki Drill 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.