ΔE 8.7, close: similar, with a visible difference side by side. Thondia Brown is a little darker, more saturated, warmer than Red Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Thondia Brown is a little darker, more saturated, warmer than Red Brown.
The same difference applies the other way round: Red Brown is a little lighter, more muted, 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 Red Brown on the colour wheel See Thondia Brown on the colour wheel
All matches: Red Brown equivalents · Thondia Brown equivalents