ΔE 14.9, fair: the same colour family, but not a straight swap. Reddish Flesh is noticeably lighter, cooler than Ratskin Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Reddish Flesh is noticeably lighter, cooler than Ratskin Flesh.
The same difference applies the other way round: Ratskin Flesh is noticeably darker, 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 Reddish Flesh on the colour wheel
All matches: Ratskin Flesh equivalents · Reddish Flesh equivalents