Golden Griffon vs Yellow Green

How close are they?

ΔE 22.3, loose: different enough that you should pick on purpose. Yellow Green is more muted, cooler than Golden Griffon.

Can I use Yellow Green instead of Golden Griffon?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Yellow Green is more muted, cooler than Golden Griffon.

Can I use Golden Griffon instead of Yellow Green?

The same difference applies the other way round: Golden Griffon is 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.