ΔE 10.5, fair: the same colour family, but not a straight swap. Steel Legion Drab is a little darker than March of the Fire Ants.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Steel Legion Drab is a little darker than March of the Fire Ants.
The same difference applies the other way round: March of the Fire Ants is a little lighter.
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 March of the Fire Ants on the colour wheel See Steel Legion Drab on the colour wheel
All matches: March of the Fire Ants equivalents · Steel Legion Drab equivalents