ΔE 39.6, loose: different enough that you should pick on purpose. Mahogany Ink is much more muted, warmer than Matt Bluish Black.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 40). Mahogany Ink is much more muted, warmer than Matt Bluish Black.
The same difference applies the other way round: Matt Bluish Black is much more saturated, cooler.
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 Matt Bluish Black on the colour wheel See Mahogany Ink on the colour wheel
All matches: Matt Bluish Black equivalents · Mahogany Ink equivalents