ΔE 16.0, loose: different enough that you should pick on purpose. Warm Grey is a little lighter, more muted, cooler than Advanced Flesh Tone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Warm Grey is a little lighter, more muted, cooler than Advanced Flesh Tone.
The same difference applies the other way round: Advanced Flesh Tone is a little darker, 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 Advanced Flesh Tone on the colour wheel See Warm Grey on the colour wheel
All matches: Advanced Flesh Tone equivalents · Warm Grey equivalents