Algae Green vs Bronze Yellow

How close are they?

ΔE 27.1, loose: different enough that you should pick on purpose. Bronze Yellow is more saturated, warmer than Algae Green.

Can I use Bronze Yellow instead of Algae Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Bronze Yellow is more saturated, warmer than Algae Green.

Can I use Algae Green instead of Bronze Yellow?

The same difference applies the other way round: Algae Green is more muted, 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.