ΔE 9.0, close: similar, with a visible difference side by side. Cam. Dark Green is a little lighter, more saturated than Decay Black.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Cam. Dark Green is a little lighter, more saturated than Decay Black.
The same difference applies the other way round: Decay Black is a little darker, 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 Decay Black on the colour wheel See Cam. Dark Green on the colour wheel
All matches: Decay Black equivalents · Cam. Dark Green equivalents