Tyran Blue vs Tempest Blue Wash

How close are they?

ΔE 34.6, loose: different enough that you should pick on purpose. Tempest Blue Wash is a little darker, much more muted, cooler than Tyran Blue.

Can I use Tempest Blue Wash instead of Tyran Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Tempest Blue Wash is a little darker, much more muted, cooler than Tyran Blue.

Can I use Tyran Blue instead of Tempest Blue Wash?

The same difference applies the other way round: Tyran Blue is a little lighter, much more saturated, 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.