Bloodreaver Flesh vs Dark Flesh

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Dark Flesh is more muted than Bloodreaver Flesh.

Can I use Dark Flesh instead of Bloodreaver Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Flesh is more muted than Bloodreaver Flesh.

Can I use Bloodreaver Flesh instead of Dark Flesh?

The same difference applies the other way round: Bloodreaver Flesh 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.