ΔE 9.4, close: similar, with a visible difference side by side. Flat Brown is a little darker, more muted than Fur Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Flat Brown is a little darker, more muted than Fur Brown.
The same difference applies the other way round: Fur Brown is a little lighter, 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 Fur Brown on the colour wheel See Flat Brown on the colour wheel
All matches: Fur Brown equivalents · Flat Brown equivalents