Astorath Red vs Magenta

How close are they?

ΔE 17.9, loose: different enough that you should pick on purpose. Magenta is noticeably darker, more muted, cooler than Astorath Red.

Can I use Magenta instead of Astorath Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Magenta is noticeably darker, more muted, cooler than Astorath Red.

Can I use Astorath Red instead of Magenta?

The same difference applies the other way round: Astorath Red is noticeably lighter, more saturated, 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.