Rosy Highlight vs Rosy Flesh

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Rosy Flesh is more saturated than Rosy Highlight.

Can I use Rosy Flesh instead of Rosy Highlight?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Rosy Flesh is more saturated than Rosy Highlight.

Can I use Rosy Highlight instead of Rosy Flesh?

The same difference applies the other way round: Rosy Highlight 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.