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