ΔE 24.3, loose: different enough that you should pick on purpose. Ink Skin is a little darker, much more muted, cooler than Red Ink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Ink Skin is a little darker, much more muted, cooler than Red Ink.
The same difference applies the other way round: Red Ink is a little 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 Red Ink on the colour wheel See Ink Skin on the colour wheel
All matches: Red Ink equivalents · Ink Skin equivalents