Camel Yellow vs Flat Yellow

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Flat Yellow is more muted than Camel Yellow.

Can I use Flat Yellow instead of Camel Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Flat Yellow is more muted than Camel Yellow.

Can I use Camel Yellow instead of Flat Yellow?

The same difference applies the other way round: Camel Yellow is more saturated.

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.