ΔE 19.7, loose: different enough that you should pick on purpose. Succubus Skin is a little darker, more muted, cooler than Ratskin Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Succubus Skin is a little darker, more muted, cooler than Ratskin Flesh.
The same difference applies the other way round: Ratskin Flesh 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 Ratskin Flesh on the colour wheel See Succubus Skin on the colour wheel
All matches: Ratskin Flesh equivalents · Succubus Skin equivalents