ΔE 8.3, close: similar, with a visible difference side by side. Skavenblight Dinge is more saturated than Onyx Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Skavenblight Dinge is more saturated than Onyx Skin.
The same difference applies the other way round: Onyx Skin is more muted.
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 Onyx Skin on the colour wheel See Skavenblight Dinge on the colour wheel
All matches: Onyx Skin equivalents · Skavenblight Dinge equivalents