Goblin Green vs Irati Green

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Irati Green is a little darker, more muted, cooler than Goblin Green.

Can I use Irati Green instead of Goblin Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Irati Green is a little darker, more muted, cooler than Goblin Green.

Can I use Goblin Green instead of Irati Green?

The same difference applies the other way round: Goblin Green is a little lighter, 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.