ΔE 14.2, fair: the same colour family, but not a straight swap. Steel Legion Drab is noticeably lighter, more muted, warmer than Dark Olive Drab.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Steel Legion Drab is noticeably lighter, more muted, warmer than Dark Olive Drab.
The same difference applies the other way round: Dark Olive Drab is noticeably darker, more saturated, 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 Olive Drab on the colour wheel See Steel Legion Drab on the colour wheel
All matches: Dark Olive Drab equivalents · Steel Legion Drab equivalents