Brown Ink vs Mahogany Ink

How close are they?

ΔE 18.5, loose: different enough that you should pick on purpose. Mahogany Ink is noticeably darker, more muted, cooler than Brown Ink.

Can I use Mahogany Ink instead of Brown Ink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Mahogany Ink is noticeably darker, more muted, cooler than Brown Ink.

Can I use Brown Ink instead of Mahogany Ink?

The same difference applies the other way round: Brown Ink is noticeably lighter, 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.