ΔE 10.5, fair: the same colour family, but not a straight swap. Gangrene is a little darker, more saturated than Dark DAK Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Gangrene is a little darker, more saturated than Dark DAK Green.
The same difference applies the other way round: Dark DAK Green is a little lighter, 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 Dark DAK Green on the colour wheel See Gangrene on the colour wheel
All matches: Dark DAK Green equivalents · Gangrene equivalents