ΔE 13.5, fair: the same colour family, but not a straight swap. Mahogany Brown is noticeably lighter, cooler than Oxide Brown Dark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Mahogany Brown is noticeably lighter, cooler than Oxide Brown Dark.
The same difference applies the other way round: Oxide Brown Dark is noticeably darker, 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 Oxide Brown Dark on the colour wheel See Mahogany Brown on the colour wheel
All matches: Oxide Brown Dark equivalents · Mahogany Brown equivalents