ΔE 23.5, loose: different enough that you should pick on purpose. Ink Magenta is a little lighter, cooler than Inktense Crimson.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Ink Magenta is a little lighter, cooler than Inktense Crimson.
The same difference applies the other way round: Inktense Crimson is a little darker, 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 Inktense Crimson on the colour wheel See Ink Magenta on the colour wheel
All matches: Inktense Crimson equivalents · Ink Magenta equivalents