ΔE 6.2, close: similar, with a visible difference side by side. Leather Brown is a little lighter, warmer than Saddle Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Leather Brown is a little lighter, warmer than Saddle Brown.
The same difference applies the other way round: Saddle Brown is a little darker, 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 Saddle Brown on the colour wheel See Leather Brown on the colour wheel
All matches: Saddle Brown equivalents · Leather Brown equivalents