Storm Surge Green vs Amber Green

How close are they?

ΔE 25.5, loose: different enough that you should pick on purpose. Amber Green is much more saturated, warmer than Storm Surge Green.

Can I use Amber Green instead of Storm Surge Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Amber Green is much more saturated, warmer than Storm Surge Green.

Can I use Storm Surge Green instead of Amber Green?

The same difference applies the other way round: Storm Surge Green is much 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.