ΔE 15.1, loose: different enough that you should pick on purpose. Dark Flesh Tone is a little lighter, much more muted than Mephiston Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Dark Flesh Tone is a little lighter, much more muted than Mephiston Red.
The same difference applies the other way round: Mephiston Red is a little darker, much more saturated.
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 Mephiston Red on the colour wheel See Dark Flesh Tone on the colour wheel
All matches: Mephiston Red equivalents · Dark Flesh Tone equivalents