ΔE 11.4, fair: the same colour family, but not a straight swap. Dark Rust is a little darker, more muted, cooler than Mahogany.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Rust is a little darker, more muted, cooler than Mahogany.
The same difference applies the other way round: Mahogany is a little lighter, more saturated, 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 Mahogany on the colour wheel See Dark Rust on the colour wheel
All matches: Mahogany equivalents · Dark Rust equivalents