ΔE 24.8, loose: different enough that you should pick on purpose. Mythic Turquoise is much more muted, cooler than Talisman Teal.
✓ Two Thin Coats comparison chart lists these two as equivalents.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Mythic Turquoise is much more muted, cooler than Talisman Teal.
The same difference applies the other way round: Talisman Teal is 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.
See Talisman Teal on the colour wheel See Mythic Turquoise on the colour wheel
All matches: Talisman Teal equivalents · Mythic Turquoise equivalents