Orruk Flesh vs Phthalo Green (Blue Shade)

How close are they?

ΔE 21.0, loose: different enough that you should pick on purpose. Phthalo Green (Blue Shade) is a little darker, more muted, cooler than Orruk Flesh.

Can I use Phthalo Green (Blue Shade) instead of Orruk Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Phthalo Green (Blue Shade) is a little darker, more muted, cooler than Orruk Flesh.

Can I use Orruk Flesh instead of Phthalo Green (Blue Shade)?

The same difference applies the other way round: Orruk Flesh 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.