Pyrrhic Dawn vs Ungor Flesh

How close are they?

ΔE 20.2, loose: different enough that you should pick on purpose. Ungor Flesh is a little darker, more muted, cooler than Pyrrhic Dawn.

Can I use Ungor Flesh instead of Pyrrhic Dawn?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Ungor Flesh is a little darker, more muted, cooler than Pyrrhic Dawn.

Can I use Pyrrhic Dawn instead of Ungor Flesh?

The same difference applies the other way round: Pyrrhic Dawn is a little lighter, more saturated, warmer.

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.