ΔE 13.8, fair: the same colour family, but not a straight swap. Dark Green is a little lighter, more saturated, cooler than Moss Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Green is a little lighter, more saturated, cooler than Moss Green.
The same difference applies the other way round: Moss Green is a little darker, more muted, warmer.
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 Moss Green on the colour wheel See Dark Green on the colour wheel
All matches: Moss Green equivalents · Dark Green equivalents