ΔE 8.7, close: similar, with a visible difference side by side. IJA Earth Brown is a little lighter, more muted, cooler than Wood Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJA Earth Brown is a little lighter, more muted, cooler than Wood Brown.
The same difference applies the other way round: Wood Brown is a little darker, more saturated, 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 Wood Brown on the colour wheel See IJA Earth Brown on the colour wheel
All matches: Wood Brown equivalents · IJA Earth Brown equivalents