Eternal Hunt vs Leaf Green

How close are they?

ΔE 18.3, loose: different enough that you should pick on purpose. Leaf Green is a little darker, much more muted, cooler than Eternal Hunt.

Can I use Leaf Green instead of Eternal Hunt?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Leaf Green is a little darker, much more muted, cooler than Eternal Hunt.

Can I use Eternal Hunt instead of Leaf Green?

The same difference applies the other way round: Eternal Hunt is a little lighter, much 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.