ΔE 13.7, fair: the same colour family, but not a straight swap. Oxide Green is much 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 14). Oxide Green is much more saturated, cooler than Olive Drab.
The same difference applies the other way round: Olive Drab is much 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 Oxide Green on the colour wheel
All matches: Olive Drab equivalents · Oxide Green equivalents