Valkyrie Yellow vs Dead Flesh

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Dead Flesh is a little darker, more muted than Valkyrie Yellow.

Can I use Dead Flesh instead of Valkyrie Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dead Flesh is a little darker, more muted than Valkyrie Yellow.

Can I use Valkyrie Yellow instead of Dead Flesh?

The same difference applies the other way round: Valkyrie Yellow is a little lighter, 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.