Warlock Magenta vs Pink

How close are they?

ΔE 20.1, loose: different enough that you should pick on purpose. Pink is a little lighter, warmer than Warlock Magenta.

Can I use Pink instead of Warlock Magenta?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Pink is a little lighter, warmer than Warlock Magenta.

Can I use Warlock Magenta instead of Pink?

The same difference applies the other way round: Warlock Magenta is a little darker, cooler.

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.