ΔE 7.7, close: similar, with a visible difference side by side. Buff is a little lighter than Zinc Chromate Yellow.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Buff is a little lighter than Zinc Chromate Yellow.
The same difference applies the other way round: Zinc Chromate Yellow is a little darker.
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 Buff on the colour wheel
All matches: Zinc Chromate Yellow equivalents · Buff equivalents