Dark Sea Blue vs Thunderhawk Blue

How close are they?

ΔE 13.1, fair: the same colour family, but not a straight swap. Thunderhawk Blue is a little lighter, cooler than Dark Sea Blue.

Can I use Thunderhawk Blue instead of Dark Sea Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Thunderhawk Blue is a little lighter, cooler than Dark Sea Blue.

Can I use Dark Sea Blue instead of Thunderhawk Blue?

The same difference applies the other way round: Dark Sea 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.