ΔE 6.9, close: similar, with a visible difference side by side. Mahogany Brown is a little lighter, cooler than Ashroot.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Mahogany Brown is a little lighter, cooler than Ashroot.
The same difference applies the other way round: Ashroot is a little 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 Ashroot on the colour wheel See Mahogany Brown on the colour wheel
All matches: Ashroot equivalents · Mahogany Brown equivalents