ΔE 13.2, fair: the same colour family, but not a straight swap. Emerald is a little lighter, cooler than Dark Evergreen.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Emerald is a little lighter, cooler than Dark Evergreen.
The same difference applies the other way round: Dark Evergreen is a little darker, 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 Dark Evergreen on the colour wheel See Emerald on the colour wheel
All matches: Dark Evergreen equivalents · Emerald equivalents