Hoeth Blue vs Zima Blue

How close are they?

ΔE 22.1, loose: different enough that you should pick on purpose. Zima Blue is a little lighter, cooler than Hoeth Blue.

Can I use Zima Blue instead of Hoeth Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Zima Blue is a little lighter, cooler than Hoeth Blue.

Can I use Hoeth Blue instead of Zima Blue?

The same difference applies the other way round: Hoeth Blue is a little darker, 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.