Cobalt Metal vs 3D Glasses

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. 3D Glasses is noticeably lighter, warmer than Cobalt Metal.

Can I use 3D Glasses instead of Cobalt Metal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). 3D Glasses is noticeably lighter, warmer than Cobalt Metal.

Can I use Cobalt Metal instead of 3D Glasses?

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