ΔE 8.5, close: similar, with a visible difference side by side. Ink Skin is a little darker, cooler than Rhinox Hide. They are different kinds of paint: Citadel Rhinox Hide is an opaque base/layer paint and Vallejo Ink Skin 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 9). Ink Skin is a little darker, cooler than Rhinox Hide. They are different kinds of paint.
The same difference applies the other way round: Rhinox Hide 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 Rhinox Hide on the colour wheel See Ink Skin on the colour wheel
All matches: Rhinox Hide equivalents · Ink Skin equivalents