Violet Sunset vs Amethyst Purple

How close are they?

ΔE 29.3, loose: different enough that you should pick on purpose. Amethyst Purple is a little lighter, much more muted, cooler than Violet Sunset.

Can I use Amethyst Purple instead of Violet Sunset?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Amethyst Purple is a little lighter, much more muted, cooler than Violet Sunset.

Can I use Violet Sunset instead of Amethyst Purple?

The same difference applies the other way round: Violet Sunset is a little darker, much 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.