Amulet Purple vs Grey Blue

How close are they?

ΔE 15.8, loose: different enough that you should pick on purpose. Grey Blue is more muted, cooler than Amulet Purple.

Can I use Grey Blue instead of Amulet Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Grey Blue is more muted, cooler than Amulet Purple.

Can I use Amulet Purple instead of Grey Blue?

The same difference applies the other way round: Amulet Purple is more saturated, warmer.

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.