ΔE 15.2, loose: different enough that you should pick on purpose. Athena Skin is a little darker, much more saturated, cooler than Advanced Flesh Tone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Athena Skin is a little darker, much more saturated, cooler than Advanced Flesh Tone.
The same difference applies the other way round: Advanced Flesh Tone is a little lighter, 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 Advanced Flesh Tone on the colour wheel See Athena Skin on the colour wheel
All matches: Advanced Flesh Tone equivalents · Athena Skin equivalents