ΔE 6.7, close: similar, with a visible difference side by side. Burnt Umber is a little darker, warmer than Mahogany.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Burnt Umber is a little darker, warmer than Mahogany.
The same difference applies the other way round: Mahogany is a little lighter, 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 Mahogany on the colour wheel See Burnt Umber on the colour wheel
All matches: Mahogany equivalents · Burnt Umber equivalents