ΔE 6.9, close: similar, with a visible difference side by side. Brown Ink is a little lighter, cooler than Sylvaneth Bark. They are different kinds of paint: Citadel Sylvaneth Bark is an opaque base/layer paint and Formula P3 Brown Ink is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Brown Ink is a little lighter, cooler than Sylvaneth Bark. They are different kinds of paint.
The same difference applies the other way round: Sylvaneth Bark 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 Sylvaneth Bark on the colour wheel See Brown Ink on the colour wheel
All matches: Sylvaneth Bark equivalents · Brown Ink equivalents