ΔE 15.1, loose: different enough that you should pick on purpose. Pure Filth is much more saturated, cooler than Gnome Cheeks.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Pure Filth is much more saturated, cooler than Gnome Cheeks.
The same difference applies the other way round: Gnome Cheeks is much more muted, 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 Gnome Cheeks on the colour wheel See Pure Filth on the colour wheel
All matches: Gnome Cheeks equivalents · Pure Filth equivalents