ΔE 14.8, fair: the same colour family, but not a straight swap. Topaz Skin is a little lighter, more muted, warmer than Terracota.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Topaz Skin is a little lighter, more muted, warmer than Terracota.
The same difference applies the other way round: Terracota 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 Terracota on the colour wheel See Topaz Skin on the colour wheel
All matches: Terracota equivalents · Topaz Skin equivalents