ΔE 9.1, close: similar, with a visible difference side by side. Violet Grey is a little darker, more muted than Mud Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Violet Grey is a little darker, more muted than Mud Brown.
The same difference applies the other way round: Mud Brown is a little lighter, more saturated.
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 Mud Brown on the colour wheel See Violet Grey on the colour wheel
All matches: Mud Brown equivalents · Violet Grey equivalents