ΔE 6.4, close: similar, with a visible difference side by side. Deck Tan is more saturated than IJA Grey Green.
✓ AMMO ATOM user guide chart lists these two as equivalents.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Deck Tan is more saturated than IJA Grey Green.
The same difference applies the other way round: IJA Grey Green is more muted.
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 IJA Grey Green on the colour wheel See Deck Tan on the colour wheel
All matches: IJA Grey Green equivalents · Deck Tan equivalents