Amethyst vs Genestealer Purple

How close are they?

ΔE 11.5, fair: the same colour family, but not a straight swap. Genestealer Purple is a little darker, cooler than Amethyst.

Can I use Genestealer Purple instead of Amethyst?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Genestealer Purple is a little darker, cooler than Amethyst.

Can I use Amethyst instead of Genestealer Purple?

The same difference applies the other way round: Amethyst is a little lighter, 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.