ΔE 6.5, close: similar, with a visible difference side by side. Chromium Oxide Green Dark is more saturated, cooler than Army Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Chromium Oxide Green Dark is more saturated, cooler than Army Green.
The same difference applies the other way round: Army Green is more muted, 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 Army Green on the colour wheel See Chromium Oxide Green Dark on the colour wheel
All matches: Army Green equivalents · Chromium Oxide Green Dark equivalents