ΔE 9.0, close: similar, with a visible difference side by side. IJA Earth Brown is more muted, cooler than Sylvaneth Bark.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJA Earth Brown is more muted, cooler than Sylvaneth Bark.
The same difference applies the other way round: Sylvaneth Bark is 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 Sylvaneth Bark on the colour wheel See IJA Earth Brown on the colour wheel
All matches: Sylvaneth Bark equivalents · IJA Earth Brown equivalents