ΔE 7.2, close: similar, with a visible difference side by side. Grey Brown is warmer than US Olive Base Uniform.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Grey Brown is warmer than US Olive Base Uniform.
The same difference applies the other way round: US Olive Base Uniform is 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 US Olive Base Uniform on the colour wheel See Grey Brown on the colour wheel
All matches: US Olive Base Uniform equivalents · Grey Brown equivalents