ΔE 12.9, fair: the same colour family, but not a straight swap. March of the Fire Ants is noticeably darker than Monster Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). March of the Fire Ants is noticeably darker than Monster Brown.
The same difference applies the other way round: Monster Brown is noticeably 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 Monster Brown on the colour wheel See March of the Fire Ants on the colour wheel
All matches: Monster Brown equivalents · March of the Fire Ants equivalents