Metallic Black vs Bronze

How close are they?

ΔE 17.5, loose: different enough that you should pick on purpose. Bronze is a little darker, much more saturated than Metallic Black.

Can I use Bronze instead of Metallic Black?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Bronze is a little darker, much more saturated than Metallic Black.

Can I use Metallic Black instead of Bronze?

The same difference applies the other way round: Metallic Black is a little lighter, 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.