Dark Imperial Khaki vs Phthalo Green

How close are they?

ΔE 21.6, loose: different enough that you should pick on purpose. Phthalo Green is a little darker, more saturated, cooler than Dark Imperial Khaki.

Can I use Phthalo Green instead of Dark Imperial Khaki?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Phthalo Green is a little darker, more saturated, cooler than Dark Imperial Khaki.

Can I use Dark Imperial Khaki instead of Phthalo Green?

The same difference applies the other way round: Dark Imperial Khaki is a little lighter, more muted, 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.