Poison Ivy vs Park Green Flat

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Park Green Flat is a little darker than Poison Ivy.

Can I use Park Green Flat instead of Poison Ivy?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Park Green Flat is a little darker than Poison Ivy.

Can I use Poison Ivy instead of Park Green Flat?

The same difference applies the other way round: Poison Ivy is a little lighter.

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.