ΔE 23.7, loose: different enough that you should pick on purpose. Green Gold is a little darker, cooler than Golden Griffon. They are different kinds of paint: Citadel Golden Griffon is an opaque base/layer paint and Golden Green Gold is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Green Gold is a little darker, cooler than Golden Griffon. They are different kinds of paint.
The same difference applies the other way round: Golden Griffon is a little lighter, 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.
See Golden Griffon on the colour wheel See Green Gold on the colour wheel
All matches: Golden Griffon equivalents · Green Gold equivalents