ΔE 9.7, close: similar, with a visible difference side by side. Mortarion Grime is more saturated, warmer than Sooty Black INK. They are different kinds of paint: AK Interactive Sooty Black INK is an ink, glaze or transparent paint and Citadel Mortarion Grime is a wash/shade, 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 10). Mortarion Grime is more saturated, warmer than Sooty Black INK. They are different kinds of paint.
The same difference applies the other way round: Sooty Black INK is more muted, cooler.
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 Sooty Black INK on the colour wheel See Mortarion Grime on the colour wheel
All matches: Sooty Black INK equivalents · Mortarion Grime equivalents