ΔE 10.9, fair: the same colour family, but not a straight swap. Terracota is a little darker, more muted than Magenta.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Terracota is a little darker, more muted than Magenta.
The same difference applies the other way round: Magenta is a little lighter, more saturated.
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 Magenta on the colour wheel See Terracota on the colour wheel
All matches: Magenta equivalents · Terracota equivalents