Midnight Blue vs Naggaroth Night

How close are they?

ΔE 16.3, loose: different enough that you should pick on purpose. Naggaroth Night is noticeably lighter, more muted, warmer than Midnight Blue.

Can I use Naggaroth Night instead of Midnight Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Naggaroth Night is noticeably lighter, more muted, warmer than Midnight Blue.

Can I use Midnight Blue instead of Naggaroth Night?

The same difference applies the other way round: Midnight Blue is noticeably darker, 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.