ΔE 35.1, loose: different enough that you should pick on purpose. Medium Magenta is noticeably darker, much more saturated than Weird Elixir.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Medium Magenta is noticeably darker, much more saturated than Weird Elixir.
The same difference applies the other way round: Weird Elixir 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 Weird Elixir on the colour wheel See Medium Magenta on the colour wheel
All matches: Weird Elixir equivalents · Medium Magenta equivalents