ΔE 21.4, loose: different enough that you should pick on purpose. Ink Sepia is noticeably darker, more saturated than Matt Satin Black.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Ink Sepia is noticeably darker, more saturated than Matt Satin Black.
The same difference applies the other way round: Matt Satin Black is noticeably lighter, 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 Matt Satin Black on the colour wheel See Ink Sepia on the colour wheel
All matches: Matt Satin Black equivalents · Ink Sepia equivalents