ΔE 8.8, close: similar, with a visible difference side by side. Army Green is a little lighter, more muted, warmer than Zinc Chromate Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Army Green is a little lighter, more muted, warmer than Zinc Chromate Green.
The same difference applies the other way round: Zinc Chromate Green is a little darker, more saturated, 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 Zinc Chromate Green on the colour wheel See Army Green on the colour wheel
All matches: Zinc Chromate Green equivalents · Army Green equivalents