Thunder Storm vs Huldra Blue

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. Huldra Blue is noticeably lighter, more muted, warmer than Thunder Storm.

Can I use Huldra Blue instead of Thunder Storm?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Huldra Blue is noticeably lighter, more muted, warmer than Thunder Storm.

Can I use Thunder Storm instead of Huldra Blue?

The same difference applies the other way round: Thunder Storm is noticeably darker, more saturated, cooler.

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.