Talisman Teal vs Greenskin Flesh

How close are they?

ΔE 25.1, loose: different enough that you should pick on purpose. Greenskin Flesh is noticeably darker, warmer than Talisman Teal.

Can I use Greenskin Flesh instead of Talisman Teal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Greenskin Flesh is noticeably darker, warmer than Talisman Teal.

Can I use Talisman Teal instead of Greenskin Flesh?

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