ΔE 30.4, loose: different enough that you should pick on purpose. Pastel Violet is a little darker, more muted, cooler than Pixie Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Pastel Violet is a little darker, more muted, cooler than Pixie Pink.
The same difference applies the other way round: Pixie Pink is a little 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 Pixie Pink on the colour wheel See Pastel Violet on the colour wheel
All matches: Pixie Pink equivalents · Pastel Violet equivalents