ΔE 15.1, loose: different enough that you should pick on purpose. Lavender is a little darker, more saturated, cooler than Warlock Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Lavender is a little darker, more saturated, cooler than Warlock Magenta.
The same difference applies the other way round: Warlock Magenta 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 Warlock Magenta on the colour wheel See Lavender on the colour wheel
All matches: Warlock Magenta equivalents · Lavender equivalents