Magecast Magenta vs Liche Purple

How close are they?

ΔE 21.2, loose: different enough that you should pick on purpose. Liche Purple is noticeably darker, much more muted than Magecast Magenta.

Can I use Liche Purple instead of Magecast Magenta?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Liche Purple is noticeably darker, much more muted than Magecast Magenta.

Can I use Magecast Magenta instead of Liche Purple?

The same difference applies the other way round: Magecast Magenta is noticeably lighter, 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.