Gold vs Amber Green

How close are they?

ΔE 31.3, loose: different enough that you should pick on purpose. Amber Green is noticeably darker, more muted, cooler than Gold.

Can I use Amber Green instead of Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Amber Green is noticeably darker, more muted, cooler than Gold.

Can I use Gold instead of Amber Green?

The same difference applies the other way round: Gold is noticeably lighter, more saturated, warmer.

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.