ΔE 9.7, close: similar, with a visible difference side by side. German Yellow is a little lighter, cooler than Zinc Chromate Yellow.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). German Yellow is a little lighter, cooler than Zinc Chromate Yellow.
The same difference applies the other way round: Zinc Chromate Yellow is a little darker, 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 Zinc Chromate Yellow on the colour wheel See German Yellow on the colour wheel
All matches: Zinc Chromate Yellow equivalents · German Yellow equivalents