Necromancer Cloak vs N5 Neutral Gray

How close are they?

ΔE 16.1, loose: different enough that you should pick on purpose. N5 Neutral Gray is noticeably lighter, more muted than Necromancer Cloak.

Can I use N5 Neutral Gray instead of Necromancer Cloak?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). N5 Neutral Gray is noticeably lighter, more muted than Necromancer Cloak.

Can I use Necromancer Cloak instead of N5 Neutral Gray?

The same difference applies the other way round: Necromancer Cloak is noticeably darker, more saturated.

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.