ΔE 9.2, close: similar, with a visible difference side by side. Starship Filth is more muted, cooler than Matt Grime.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Starship Filth is more muted, cooler than Matt Grime.
The same difference applies the other way round: Matt Grime 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 Matt Grime on the colour wheel See Starship Filth on the colour wheel
All matches: Matt Grime equivalents · Starship Filth equivalents