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