ΔE 24.2, loose: different enough that you should pick on purpose. Fairy Skin is noticeably lighter, more muted, cooler than Rage Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Fairy Skin is noticeably lighter, more muted, cooler than Rage Brown.
The same difference applies the other way round: Rage Brown is noticeably 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 Rage Brown on the colour wheel See Fairy Skin on the colour wheel
All matches: Rage Brown equivalents · Fairy Skin equivalents