Cobalt Metal vs Black Metal

How close are they?

ΔE 23.9, loose: different enough that you should pick on purpose. Black Metal is noticeably darker, much more muted than Cobalt Metal.

Can I use Black Metal instead of Cobalt Metal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Black Metal is noticeably darker, much more muted than Cobalt Metal.

Can I use Cobalt Metal instead of Black Metal?

The same difference applies the other way round: Cobalt Metal is noticeably lighter, much 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.