ΔE 9.2, close: similar, with a visible difference side by side. USA Olive Drab is more muted, cooler than Ammo Pouch Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). USA Olive Drab is more muted, cooler than Ammo Pouch Brown.
The same difference applies the other way round: Ammo Pouch Brown 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 Ammo Pouch Brown on the colour wheel See USA Olive Drab on the colour wheel
All matches: Ammo Pouch Brown equivalents · USA Olive Drab equivalents