Inktense Oxide vs Mahogany Ink

How close are they?

ΔE 33.3, loose: different enough that you should pick on purpose. Mahogany Ink is a little darker, much more muted, cooler than Inktense Oxide.

Can I use Mahogany Ink instead of Inktense Oxide?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Mahogany Ink is a little darker, much more muted, cooler than Inktense Oxide.

Can I use Inktense Oxide instead of Mahogany Ink?

The same difference applies the other way round: Inktense Oxide is a little 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.