ΔE 24.5, loose: different enough that you should pick on purpose. Doomfire Magenta is noticeably darker, more saturated, cooler than Fluorescent Magenta. They are different kinds of paint: AK Interactive Fluorescent Magenta is a fluorescent or effect paint and Citadel Doomfire Magenta is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Doomfire Magenta is noticeably darker, more saturated, cooler than Fluorescent Magenta. They are different kinds of paint.
The same difference applies the other way round: Fluorescent Magenta 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.
See Fluorescent Magenta on the colour wheel See Doomfire Magenta on the colour wheel
All matches: Fluorescent Magenta equivalents · Doomfire Magenta equivalents