Amphora Red vs Midnight Purple

How close are they?

ΔE 24.1, loose: different enough that you should pick on purpose. Midnight Purple is noticeably darker, cooler than Amphora Red.

Can I use Midnight Purple instead of Amphora Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Midnight Purple is noticeably darker, cooler than Amphora Red.

Can I use Amphora Red instead of Midnight Purple?

The same difference applies the other way round: Amphora Red is noticeably lighter, 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.