Guardian Green vs Legion Green

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Legion Green is a little lighter, more muted, cooler than Guardian Green.

Can I use Legion Green instead of Guardian Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Legion Green is a little lighter, more muted, cooler than Guardian Green.

Can I use Guardian Green instead of Legion Green?

The same difference applies the other way round: Guardian 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.