ΔE 22.6, loose: different enough that you should pick on purpose. Fairy Skin is noticeably darker, more muted, cooler than Phoenix Feather.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Fairy Skin is noticeably darker, more muted, cooler than Phoenix Feather.
The same difference applies the other way round: Phoenix Feather is noticeably lighter, 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 Phoenix Feather on the colour wheel See Fairy Skin on the colour wheel
All matches: Phoenix Feather equivalents · Fairy Skin equivalents