ΔE 7.7, close: similar, with a visible difference side by side. Ammo Pouch Brown is a little darker, warmer than Us Olive Uniform.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ammo Pouch Brown is a little darker, warmer than Us Olive Uniform.
The same difference applies the other way round: Us Olive Uniform is a little lighter, 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 Uniform on the colour wheel See Ammo Pouch Brown on the colour wheel
All matches: Us Olive Uniform equivalents · Ammo Pouch Brown equivalents