ΔE 11.5, fair: the same colour family, but not a straight swap. Husk Brown is a little darker, cooler than Earth.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Husk Brown is a little darker, cooler than Earth.
The same difference applies the other way round: Earth is a little lighter, 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 Earth on the colour wheel See Husk Brown on the colour wheel
All matches: Earth equivalents · Husk Brown equivalents