ΔE 6.2, close: similar, with a visible difference side by side. Mahogany Brown is a little lighter, warmer than Volcano Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Mahogany Brown is a little lighter, warmer than Volcano Brown.
The same difference applies the other way round: Volcano Brown is a little darker, cooler.
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 Volcano Brown on the colour wheel See Mahogany Brown on the colour wheel
All matches: Volcano Brown equivalents · Mahogany Brown equivalents