ΔE 24.3, loose: different enough that you should pick on purpose. Amethyst Purple is noticeably darker, much more saturated than Amethyst Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Amethyst Purple is noticeably darker, much more saturated than Amethyst Purple.
The same difference applies the other way round: Amethyst Purple is noticeably lighter, much more muted.
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.
See Amethyst Purple on the colour wheel See Amethyst Purple on the colour wheel
All matches: Amethyst Purple equivalents · Amethyst Purple equivalents