ΔE 8.0, close: similar, with a visible difference side by side. Leather Brown is a little darker, cooler than British Uniform.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Leather Brown is a little darker, cooler than British Uniform.
The same difference applies the other way round: British Uniform is a little lighter, 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 British Uniform on the colour wheel See Leather Brown on the colour wheel
All matches: British Uniform equivalents · Leather Brown equivalents