Amethyst vs Pink

How close are they?

ΔE 22.2, loose: different enough that you should pick on purpose. Pink is more muted, warmer than Amethyst.

Can I use Pink instead of Amethyst?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Pink is more muted, warmer than Amethyst.

Can I use Amethyst instead of Pink?

The same difference applies the other way round: Amethyst is 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.