Sickly Pink vs Barbarian Flesh

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Barbarian Flesh is a little darker, more saturated than Sickly Pink.

Can I use Barbarian Flesh instead of Sickly Pink?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Barbarian Flesh is a little darker, more saturated than Sickly Pink.

Can I use Sickly Pink instead of Barbarian Flesh?

The same difference applies the other way round: Sickly Pink 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.