Warlock Purple vs Magenta

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Magenta is a little lighter, much more muted than Warlock Purple.

Can I use Magenta instead of Warlock Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Magenta is a little lighter, much more muted than Warlock Purple.

Can I use Warlock Purple instead of Magenta?

The same difference applies the other way round: Warlock Purple is a little darker, much more saturated.

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.