ΔE 9.1, close: similar, with a visible difference side by side. Flat Yellow is a little lighter than Cream Yellow.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Flat Yellow is a little lighter than Cream Yellow.
The same difference applies the other way round: Cream 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 Cream Yellow on the colour wheel See Flat Yellow on the colour wheel
All matches: Cream Yellow equivalents · Flat Yellow equivalents