ΔE 15.7, loose: different enough that you should pick on purpose. Cloud Pink is a little lighter, more muted, warmer than Doomfire Magenta. They are different kinds of paint: Citadel Doomfire Magenta is a one-coat contrast-style paint and Reaper Cloud Pink is an opaque base/layer 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 16). Cloud Pink is a little lighter, more muted, warmer than Doomfire Magenta. They are different kinds of paint.
The same difference applies the other way round: Doomfire Magenta is a little 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.
See Doomfire Magenta on the colour wheel See Cloud Pink on the colour wheel
All matches: Doomfire Magenta equivalents · Cloud Pink equivalents