ΔE 7.7, close: similar, with a visible difference side by side. Pylar Glacier is a little darker, cooler than Smoke Grey. They are different kinds of paint: AMMO by Mig Smoke Grey is an opaque base/layer paint and Citadel Pylar Glacier is a one-coat contrast-style 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). Pylar Glacier is a little darker, cooler than Smoke Grey. They are different kinds of paint.
The same difference applies the other way round: Smoke Grey is a little lighter, 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.
See Smoke Grey on the colour wheel See Pylar Glacier on the colour wheel
All matches: Smoke Grey equivalents · Pylar Glacier equivalents