ΔE 8.5, close: similar, with a visible difference side by side. Mahogany is more muted than Oxide Brown Dark.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Mahogany is more muted than Oxide Brown Dark.
The same difference applies the other way round: Oxide Brown Dark is more saturated.
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 on the colour wheel
All matches: Oxide Brown Dark equivalents · Mahogany equivalents