Cygor Brown vs Papyrus

How close are they?

ΔE 20.1, loose: different enough that you should pick on purpose. Papyrus is a little lighter, more saturated than Cygor Brown.

Can I use Papyrus instead of Cygor Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Papyrus is a little lighter, more saturated than Cygor Brown.

Can I use Cygor Brown instead of Papyrus?

The same difference applies the other way round: Cygor Brown is a little darker, 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.