Hexed Violet vs Amethyst Purple

How close are they?

ΔE 9.1, close: similar, with a visible difference side by side. Amethyst Purple is a little darker than Hexed Violet.

Can I use Amethyst Purple instead of Hexed Violet?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Amethyst Purple is a little darker than Hexed Violet.

Can I use Hexed Violet instead of Amethyst Purple?

The same difference applies the other way round: Hexed Violet is a little lighter.

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.