ΔE 21.1, loose: different enough that you should pick on purpose. Blueberry is a little lighter, cooler than Warlock Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Blueberry is a little lighter, cooler than Warlock Magenta.
The same difference applies the other way round: Warlock Magenta is a little darker, 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 Warlock Magenta on the colour wheel See Blueberry on the colour wheel
All matches: Warlock Magenta equivalents · Blueberry equivalents