ΔE 15.1, loose: different enough that you should pick on purpose. Light Mud is a little lighter, much more saturated than Cloudy Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Light Mud is a little lighter, much more saturated than Cloudy Grey.
The same difference applies the other way round: Cloudy Grey is a little darker, much 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 Cloudy Grey on the colour wheel See Light Mud on the colour wheel
All matches: Cloudy Grey equivalents · Light Mud equivalents