ΔE 10.5, fair: the same colour family, but not a straight swap. Flat Flesh is more saturated, warmer than Corpse Pale.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Flat Flesh is more saturated, warmer than Corpse Pale.
The same difference applies the other way round: Corpse Pale is more muted, 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 Corpse Pale on the colour wheel See Flat Flesh on the colour wheel
All matches: Corpse Pale equivalents · Flat Flesh equivalents