ΔE 17.0, loose: different enough that you should pick on purpose. German Yellow is a little lighter, much more muted, warmer than Green Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). German Yellow is a little lighter, much more muted, warmer than Green Gold.
The same difference applies the other way round: Green Gold is a little darker, much more saturated, cooler.
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 Green Gold on the colour wheel See German Yellow on the colour wheel
All matches: Green Gold equivalents · German Yellow equivalents