Storm Blue vs Faded P.R.U. Blue

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. Faded P.R.U. Blue is a little lighter, more muted, cooler than Storm Blue.

Can I use Faded P.R.U. Blue instead of Storm Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Faded P.R.U. Blue is a little lighter, more muted, cooler than Storm Blue.

Can I use Storm Blue instead of Faded P.R.U. Blue?

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