ΔE 17.1, loose: different enough that you should pick on purpose. Pallid Wych Flesh is a little darker, more muted, cooler than Dead Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Pallid Wych Flesh is a little darker, more muted, cooler than Dead Magenta.
The same difference applies the other way round: Dead Magenta is a little lighter, more saturated, 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 Dead Magenta on the colour wheel See Pallid Wych Flesh on the colour wheel
All matches: Dead Magenta equivalents · Pallid Wych Flesh equivalents