ΔE 6.6, close: similar, with a visible difference side by side. Light Mud is more muted, cooler than RLM 02 Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Mud is more muted, cooler than RLM 02 Gray.
The same difference applies the other way round: RLM 02 Gray is more saturated, warmer.
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 RLM 02 Gray on the colour wheel See Light Mud on the colour wheel
All matches: RLM 02 Gray equivalents · Light Mud equivalents