Thunder Storm vs Dark Navy Blue

How close are they?

ΔE 12.7, fair: the same colour family, but not a straight swap. Dark Navy Blue is a little lighter, more saturated, warmer than Thunder Storm.

Can I use Dark Navy 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). Dark Navy Blue is a little lighter, more saturated, warmer than Thunder Storm.

Can I use Thunder Storm instead of Dark Navy Blue?

The same difference applies the other way round: Thunder Storm is a little darker, more muted, 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.