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