ΔE 13.9, fair: the same colour family, but not a straight swap. Orange Brown is noticeably lighter, cooler than Harvest Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Orange Brown is noticeably lighter, cooler than Harvest Brown.
The same difference applies the other way round: Harvest Brown is noticeably 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 Harvest Brown on the colour wheel See Orange Brown on the colour wheel
All matches: Harvest Brown equivalents · Orange Brown equivalents