Light Earth vs Light Khaki Drill

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Light Khaki Drill is a little lighter than Light Earth.

Can I use Light Khaki Drill instead of Light Earth?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Khaki Drill is a little lighter than Light Earth.

Can I use Light Earth instead of Light Khaki Drill?

The same difference applies the other way round: Light Earth is a little darker.

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.