ΔE 13.8, fair: the same colour family, but not a straight swap. Flat Flesh is more saturated, warmer than Terracotta Pie.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Flat Flesh is more saturated, warmer than Terracotta Pie.
The same difference applies the other way round: Terracotta Pie 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 Terracotta Pie on the colour wheel See Flat Flesh on the colour wheel
All matches: Terracotta Pie equivalents · Flat Flesh equivalents