ΔE 8.6, close: similar, with a visible difference side by side. Muddy Brown is a little darker, more saturated, warmer than Skavenblight Dinge.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Muddy Brown is a little darker, more saturated, warmer than Skavenblight Dinge.
The same difference applies the other way round: Skavenblight Dinge is a little lighter, 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 Skavenblight Dinge on the colour wheel See Muddy Brown on the colour wheel
All matches: Skavenblight Dinge equivalents · Muddy Brown equivalents