ΔE 28.3, loose: different enough that you should pick on purpose. Ink Sepia is noticeably darker, much more muted, cooler than Matt Chocolate Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Ink Sepia is noticeably darker, much more muted, cooler than Matt Chocolate Brown.
The same difference applies the other way round: Matt Chocolate Brown 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 Matt Chocolate Brown on the colour wheel See Ink Sepia on the colour wheel
All matches: Matt Chocolate Brown equivalents · Ink Sepia equivalents