Naples Yellow Hue vs Fairy Flesh

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Fairy Flesh is more saturated than Naples Yellow Hue.

Can I use Fairy Flesh instead of Naples Yellow Hue?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Fairy Flesh is more saturated than Naples Yellow Hue.

Can I use Naples Yellow Hue instead of Fairy Flesh?

The same difference applies the other way round: Naples Yellow Hue is more muted.

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.