ΔE 25.3, loose: different enough that you should pick on purpose. Amethyst Purple is a little darker, more saturated, warmer than Purple Anodized Aluminum.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Amethyst Purple is a little darker, more saturated, warmer than Purple Anodized Aluminum.
The same difference applies the other way round: Purple Anodized Aluminum is a little lighter, 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 Purple Anodized Aluminum on the colour wheel See Amethyst Purple on the colour wheel
All matches: Purple Anodized Aluminum equivalents · Amethyst Purple equivalents