Canoptek Alloy vs Storm Surge Green

How close are they?

ΔE 23.2, loose: different enough that you should pick on purpose. Storm Surge Green is much more saturated, cooler than Canoptek Alloy.

Can I use Storm Surge Green instead of Canoptek Alloy?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Storm Surge Green is much more saturated, cooler than Canoptek Alloy.

Can I use Canoptek Alloy instead of Storm Surge Green?

The same difference applies the other way round: Canoptek Alloy is much more muted, 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.