ΔE 18.4, loose: different enough that you should pick on purpose. Fey Pink is much more muted, warmer than Tentacle Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Fey Pink is much more muted, warmer than Tentacle Pink.
The same difference applies the other way round: Tentacle 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 Tentacle Pink on the colour wheel See Fey Pink on the colour wheel
All matches: Tentacle Pink equivalents · Fey Pink equivalents