Bright Gold vs Antique Gold

How close are they?

ΔE 21.0, loose: different enough that you should pick on purpose. Antique Gold is a little darker, much more muted than Bright Gold.

Can I use Antique Gold instead of Bright Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Antique Gold is a little darker, much more muted than Bright Gold.

Can I use Bright Gold instead of Antique Gold?

The same difference applies the other way round: Bright Gold is a little 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.