ΔE 10.5, fair: the same colour family, but not a straight swap. Amber Green is a little lighter, cooler than Dark Emerald.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Amber Green is a little lighter, cooler than Dark Emerald.
The same difference applies the other way round: Dark Emerald 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 Emerald on the colour wheel See Amber Green on the colour wheel
All matches: Dark Emerald equivalents · Amber Green equivalents