Magmadroth Flame vs Health Red

How close are they?

ΔE 26.9, loose: different enough that you should pick on purpose. Health Red is noticeably darker, more saturated, cooler than Magmadroth Flame.

Can I use Health Red instead of Magmadroth Flame?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Health Red is noticeably darker, more saturated, cooler than Magmadroth Flame.

Can I use Magmadroth Flame instead of Health Red?

The same difference applies the other way round: Magmadroth Flame is noticeably lighter, more muted, 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.