ΔE 19.9, loose: different enough that you should pick on purpose. Blueberry is a little darker, more saturated, cooler than Violet Skies.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Blueberry is a little darker, more saturated, cooler than Violet Skies.
The same difference applies the other way round: Violet Skies is a little lighter, 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 Violet Skies on the colour wheel See Blueberry on the colour wheel
All matches: Violet Skies equivalents · Blueberry equivalents