ΔE 19.0, loose: different enough that you should pick on purpose. Alien Purple is a little darker, cooler than Violet Skies.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Alien Purple is a little darker, cooler than Violet Skies.
The same difference applies the other way round: Violet Skies is a little lighter, 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 Alien Purple on the colour wheel
All matches: Violet Skies equivalents · Alien Purple equivalents