ΔE 7.6, close: similar, with a visible difference side by side. Pearl Grey is a little lighter, more saturated than Polished Silver. They are different kinds of paint: Army Painter Polished Silver is a metallic and Scale75 Pearl Grey is a pearl paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Pearl Grey is a little lighter, more saturated than Polished Silver. They are different kinds of paint.
The same difference applies the other way round: Polished Silver is a little darker, 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.
See Polished Silver on the colour wheel See Pearl Grey on the colour wheel
All matches: Polished Silver equivalents · Pearl Grey equivalents