ΔE 11.0, fair: the same colour family, but not a straight swap. Blueberry is a little lighter, more saturated, warmer than Purple Rain.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Blueberry is a little lighter, more saturated, warmer than Purple Rain.
The same difference applies the other way round: Purple Rain is a little darker, more muted, 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 Purple Rain on the colour wheel See Blueberry on the colour wheel
All matches: Purple Rain equivalents · Blueberry equivalents