Corvus Black vs Dark Navy Blue

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Dark Navy Blue is a little lighter, much more saturated than Corvus Black.

Can I use Dark Navy Blue instead of Corvus Black?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Dark Navy Blue is a little lighter, much more saturated than Corvus Black.

Can I use Corvus Black instead of Dark Navy Blue?

The same difference applies the other way round: Corvus Black is a little darker, much more muted.

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.