Terracotta Pie vs Rosy Flesh

How close are they?

ΔE 18.4, loose: different enough that you should pick on purpose. Rosy Flesh is noticeably lighter, much more muted than Terracotta Pie.

Can I use Rosy Flesh instead of Terracotta Pie?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Rosy Flesh is noticeably lighter, much more muted than Terracotta Pie.

Can I use Terracotta Pie instead of Rosy Flesh?

The same difference applies the other way round: Terracotta Pie is noticeably darker, much 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.