ΔE 19.8, loose: different enough that you should pick on purpose. Translucent Red is warmer than Doomfire Magenta. They are different kinds of paint: Citadel Doomfire Magenta is a one-coat contrast-style paint and Tamiya Translucent Red 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 20). Translucent Red is warmer than Doomfire Magenta. They are different kinds of paint.
The same difference applies the other way round: Doomfire Magenta is 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 Translucent Red on the colour wheel
All matches: Doomfire Magenta equivalents · Translucent Red equivalents