Gryph-Charger Grey vs Grey Spell

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Grey Spell is more saturated, warmer than Gryph-Charger Grey.

Can I use Grey Spell instead of Gryph-Charger Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Grey Spell is more saturated, warmer than Gryph-Charger Grey.

Can I use Gryph-Charger Grey instead of Grey Spell?

The same difference applies the other way round: Gryph-Charger Grey is more muted, cooler.

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.