ΔE 6.1, close: similar, with a visible difference side by side. Japan. Unif. WWII is more saturated than Khaki Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Japan. Unif. WWII is more saturated than Khaki Brown.
The same difference applies the other way round: Khaki Brown is more muted.
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 Khaki Brown on the colour wheel See Japan. Unif. WWII on the colour wheel
All matches: Khaki Brown equivalents · Japan. Unif. WWII equivalents