Blood Red vs Magmadroth Flame

How close are they?

ΔE 18.2, loose: different enough that you should pick on purpose. Magmadroth Flame is noticeably lighter, more muted, warmer than Blood Red.

Can I use Magmadroth Flame instead of Blood Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Magmadroth Flame is noticeably lighter, more muted, warmer than Blood Red.

Can I use Blood Red instead of Magmadroth Flame?

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