Dusty Skull vs IDF Gray 2 (-1981 Golan)

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. IDF Gray 2 (-1981 Golan) is a little darker, more muted, cooler than Dusty Skull.

Can I use IDF Gray 2 (-1981 Golan) instead of Dusty Skull?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). IDF Gray 2 (-1981 Golan) is a little darker, more muted, cooler than Dusty Skull.

Can I use Dusty Skull instead of IDF Gray 2 (-1981 Golan)?

The same difference applies the other way round: Dusty Skull is a little lighter, 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.