Aggressor Blue FS 35109 vs Faded P.R.U. Blue

How close are they?

ΔE 8.3, close: similar, with a visible difference side by side. Faded P.R.U. Blue is more muted, cooler than Aggressor Blue FS 35109.

Can I use Faded P.R.U. Blue instead of Aggressor Blue FS 35109?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Faded P.R.U. Blue is more muted, cooler than Aggressor Blue FS 35109.

Can I use Aggressor Blue FS 35109 instead of Faded P.R.U. Blue?

The same difference applies the other way round: Aggressor Blue FS 35109 is 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.