ΔE 11.1, fair: the same colour family, but not a straight swap. Cavalry Brown is a little lighter, cooler than Red Leather.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Cavalry Brown is a little lighter, cooler than Red Leather.
The same difference applies the other way round: Red Leather is a little darker, 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 Red Leather on the colour wheel See Cavalry Brown on the colour wheel
All matches: Red Leather equivalents · Cavalry Brown equivalents