ΔE 11.7, fair: the same colour family, but not a straight swap. Olivegrove Green is noticeably darker, warmer than Dark DAK Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Olivegrove Green is noticeably darker, warmer than Dark DAK Green.
The same difference applies the other way round: Dark DAK Green is noticeably lighter, cooler.
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 Olivegrove Green on the colour wheel
All matches: Dark DAK Green equivalents · Olivegrove Green equivalents