Deep Purple vs Warlock Magenta

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Warlock Magenta is more saturated than Deep Purple.

Can I use Warlock Magenta instead of Deep Purple?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Warlock Magenta is more saturated than Deep Purple.

Can I use Deep Purple instead of Warlock Magenta?

The same difference applies the other way round: Deep Purple is more muted.

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.