Leafy Green vs Iosan Green

How close are they?

ΔE 26.4, loose: different enough that you should pick on purpose. Iosan Green is a little darker, more muted, cooler than Leafy Green.

Can I use Iosan Green instead of Leafy Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Iosan Green is a little darker, more muted, cooler than Leafy Green.

Can I use Leafy Green instead of Iosan Green?

The same difference applies the other way round: Leafy 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.