Laserface vs Amethyst Purple

How close are they?

ΔE 27.7, loose: different enough that you should pick on purpose. Amethyst Purple is a little darker, more saturated, cooler than Laserface.

Can I use Amethyst Purple instead of Laserface?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Amethyst Purple is a little darker, more saturated, cooler than Laserface.

Can I use Laserface instead of Amethyst Purple?

The same difference applies the other way round: Laserface is a little lighter, more muted, 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.