ΔE 31.9, loose: different enough that you should pick on purpose. Ink Magenta is noticeably darker, much more muted, cooler than Naphthol Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Ink Magenta is noticeably darker, much more muted, cooler than Naphthol Pink.
The same difference applies the other way round: Naphthol Pink is noticeably lighter, much more saturated, 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 Naphthol Pink on the colour wheel See Ink Magenta on the colour wheel
All matches: Naphthol Pink equivalents · Ink Magenta equivalents