ΔE 32.8, loose: different enough that you should pick on purpose. Magenta is noticeably lighter, more saturated, cooler than Amethyst Rose.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Magenta is noticeably lighter, more saturated, cooler than Amethyst Rose.
The same difference applies the other way round: Amethyst Rose is noticeably darker, 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.
See Amethyst Rose on the colour wheel See Magenta on the colour wheel
All matches: Amethyst Rose equivalents · Magenta equivalents