ΔE 10.6, fair: the same colour family, but not a straight swap. Brown Ink is a little lighter, more muted than Hobgrot Hide. They are different kinds of paint: Citadel Hobgrot Hide 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.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Brown Ink is a little lighter, more muted than Hobgrot Hide. They are different kinds of paint.
The same difference applies the other way round: Hobgrot Hide is a little darker, more saturated.
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 Hobgrot Hide on the colour wheel See Brown Ink on the colour wheel
All matches: Hobgrot Hide equivalents · Brown Ink equivalents