Warrior Skin vs Papyrus

How close are they?

ΔE 20.0, loose: different enough that you should pick on purpose. Papyrus is noticeably darker, cooler than Warrior Skin.

Can I use Papyrus instead of Warrior Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Papyrus is noticeably darker, cooler than Warrior Skin.

Can I use Warrior Skin instead of Papyrus?

The same difference applies the other way round: Warrior Skin is noticeably lighter, 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.