ΔE 53.7, loose: different enough that you should pick on purpose. Archaic Sepia Wash is noticeably lighter, much more muted, cooler than Warm Skin Tone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 54). Archaic Sepia Wash is noticeably lighter, much more muted, cooler than Warm Skin Tone.
The same difference applies the other way round: Warm Skin Tone is noticeably darker, much 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 Warm Skin Tone on the colour wheel See Archaic Sepia Wash on the colour wheel
All matches: Warm Skin Tone equivalents · Archaic Sepia Wash equivalents