ΔE 9.6, close: similar, with a visible difference side by side. Dark Green is a little darker, warmer than Deep Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dark Green is a little darker, warmer than Deep Green.
The same difference applies the other way round: Deep Green 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 Deep Green on the colour wheel See Dark Green on the colour wheel
All matches: Deep Green equivalents · Dark Green equivalents