Vulkan Green vs Legion Green

How close are they?

ΔE 19.1, loose: different enough that you should pick on purpose. Legion Green is a little lighter, more muted, cooler than Vulkan Green.

Can I use Legion Green instead of Vulkan Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Legion Green is a little lighter, more muted, cooler than Vulkan Green.

Can I use Vulkan Green instead of Legion Green?

The same difference applies the other way round: Vulkan Green is a little darker, 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.