Permanent Maroon vs Chalice Red

How close are they?

ΔE 15.8, loose: different enough that you should pick on purpose. Chalice Red is noticeably lighter, more muted than Permanent Maroon.

Can I use Chalice Red instead of Permanent Maroon?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Chalice Red is noticeably lighter, more muted than Permanent Maroon.

Can I use Permanent Maroon instead of Chalice Red?

The same difference applies the other way round: Permanent Maroon is noticeably darker, 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.