Coldstone Grey vs Faded P.R.U. Blue

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. Faded P.R.U. Blue is more saturated than Coldstone Grey.

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

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Faded P.R.U. Blue is more saturated than Coldstone Grey.

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

The same difference applies the other way round: Coldstone Grey is more muted.

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.