ΔE 24.4, loose: different enough that you should pick on purpose. Smoke Ink is noticeably lighter, more saturated than Black Ink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Smoke Ink is noticeably lighter, more saturated than Black Ink.
The same difference applies the other way round: Black Ink is noticeably darker, 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 Black Ink on the colour wheel See Smoke Ink on the colour wheel
All matches: Black Ink equivalents · Smoke Ink equivalents