ΔE 11.2, fair: the same colour family, but not a straight swap. Flat Earth is a little lighter, more muted, warmer than Carthalos Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Flat Earth is a little lighter, more muted, warmer than Carthalos Skin.
The same difference applies the other way round: Carthalos Skin is a little darker, more saturated, 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 Carthalos Skin on the colour wheel See Flat Earth on the colour wheel
All matches: Carthalos Skin equivalents · Flat Earth equivalents