ΔE 8.1, close: similar, with a visible difference side by side. Earth Green (Early) is more muted, cooler than British Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Earth Green (Early) is more muted, cooler than British Khaki.
The same difference applies the other way round: British Khaki is more saturated, warmer.
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 British Khaki on the colour wheel See Earth Green (Early) on the colour wheel
All matches: British Khaki equivalents · Earth Green (Early) equivalents