ΔE 15.0, loose: different enough that you should pick on purpose. Orange Brown is much more muted, cooler than Orange Leather.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Orange Brown is much more muted, cooler than Orange Leather.
The same difference applies the other way round: Orange Leather is much more saturated, 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 Orange Leather on the colour wheel See Orange Brown on the colour wheel
All matches: Orange Leather equivalents · Orange Brown equivalents