ΔE 14.1, fair: the same colour family, but not a straight swap. Saddle Brown is a little lighter, cooler than Drab Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Saddle Brown is a little lighter, cooler than Drab Brown.
The same difference applies the other way round: Drab Brown 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 Drab Brown on the colour wheel See Saddle Brown on the colour wheel
All matches: Drab Brown equivalents · Saddle Brown equivalents