Talisman Teal vs Phthalo Green

How close are they?

ΔE 23.6, loose: different enough that you should pick on purpose. Phthalo Green is noticeably darker, much more muted, cooler than Talisman Teal.

Can I use Phthalo Green instead of Talisman Teal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Phthalo Green is noticeably darker, much more muted, cooler than Talisman Teal.

Can I use Talisman Teal instead of Phthalo Green?

The same difference applies the other way round: Talisman Teal is noticeably lighter, much 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.