Pale Flesh vs Rosy Flesh

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Rosy Flesh is a little darker, more saturated than Pale Flesh.

Can I use Rosy Flesh instead of Pale Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Rosy Flesh is a little darker, more saturated than Pale Flesh.

Can I use Pale Flesh instead of Rosy Flesh?

The same difference applies the other way round: Pale Flesh is a little lighter, 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.