ΔE 51.1, loose: different enough that you should pick on purpose. Fairy Skin is much more muted, warmer than Familiar Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 51). Fairy Skin is much more muted, warmer than Familiar Pink.
The same difference applies the other way round: Familiar Pink is much 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 Familiar Pink on the colour wheel See Fairy Skin on the colour wheel
All matches: Familiar Pink equivalents · Fairy Skin equivalents