Piggy Purple Ink vs Mahogany Ink

How close are they?

ΔE 31.1, loose: different enough that you should pick on purpose. Mahogany Ink is a little darker, much more muted, warmer than Piggy Purple Ink.

Can I use Mahogany Ink instead of Piggy Purple Ink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Mahogany Ink is a little darker, much more muted, warmer than Piggy Purple Ink.

Can I use Piggy Purple Ink instead of Mahogany Ink?

The same difference applies the other way round: Piggy Purple Ink is a little lighter, 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.