Umberroot vs Permanent Maroon

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Permanent Maroon is noticeably darker, more saturated, cooler than Umberroot.

Can I use Permanent Maroon instead of Umberroot?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Permanent Maroon is noticeably darker, more saturated, cooler than Umberroot.

Can I use Umberroot instead of Permanent Maroon?

The same difference applies the other way round: Umberroot is noticeably lighter, more muted, 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.