Amethyst Purple vs Light Violet

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Light Violet is a little lighter than Amethyst Purple.

Can I use Light Violet instead of Amethyst Purple?

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

Can I use Amethyst Purple instead of Light Violet?

The same difference applies the other way round: Amethyst Purple is a little darker.

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.