ΔE 9.7, close: similar, with a visible difference side by side. Leather Brown is a little darker, more saturated than Desert Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Leather Brown is a little darker, more saturated than Desert Brown.
The same difference applies the other way round: Desert Brown is a little lighter, more muted.
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 Desert Brown on the colour wheel See Leather Brown on the colour wheel
All matches: Desert Brown equivalents · Leather Brown equivalents