ΔE 11.2, fair: the same colour family, but not a straight swap. Worn Olive is a little lighter, more saturated, warmer than Drab Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Worn Olive is a little lighter, more saturated, warmer than Drab Green.
The same difference applies the other way round: Drab Green is a little darker, more muted, 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 Drab Green on the colour wheel See Worn Olive on the colour wheel
All matches: Drab Green equivalents · Worn Olive equivalents