ΔE 12.5, fair: the same colour family, but not a straight swap. Celestial Violet is a little lighter, more saturated, cooler than Pink Nacre.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Celestial Violet is a little lighter, more saturated, cooler than Pink Nacre.
The same difference applies the other way round: Pink Nacre is a little darker, more muted, 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 Pink Nacre on the colour wheel See Celestial Violet on the colour wheel
All matches: Pink Nacre equivalents · Celestial Violet equivalents