ΔE 9.1, close: similar, with a visible difference side by side. Dirt is more muted, warmer than Dark Mustard Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dirt is more muted, warmer than Dark Mustard Khaki.
The same difference applies the other way round: Dark Mustard Khaki is more saturated, 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 Mustard Khaki on the colour wheel See Dirt on the colour wheel
All matches: Dark Mustard Khaki equivalents · Dirt equivalents