ΔE 18.5, loose: different enough that you should pick on purpose. Amethyst Purple is a little lighter, more saturated, warmer than Sparkling Amethyst.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Amethyst Purple is a little lighter, more saturated, warmer than Sparkling Amethyst.
The same difference applies the other way round: Sparkling Amethyst is a little darker, more muted, cooler.
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 Sparkling Amethyst on the colour wheel See Amethyst Purple on the colour wheel
All matches: Sparkling Amethyst equivalents · Amethyst Purple equivalents