ΔE 11.0, fair: the same colour family, but not a straight swap. Red Leather is a little lighter, warmer than Umber Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Red Leather is a little lighter, warmer than Umber Brown.
The same difference applies the other way round: Umber 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 Umber Brown on the colour wheel See Red Leather on the colour wheel
All matches: Umber Brown equivalents · Red Leather equivalents