Pharaoh Guard vs Phthalo Green (Blue Shade)

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Phthalo Green (Blue Shade) is more saturated, warmer than Pharaoh Guard.

Can I use Phthalo Green (Blue Shade) instead of Pharaoh Guard?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Phthalo Green (Blue Shade) is more saturated, warmer than Pharaoh Guard.

Can I use Pharaoh Guard instead of Phthalo Green (Blue Shade)?

The same difference applies the other way round: Pharaoh Guard 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.