ΔE 29.7, loose: different enough that you should pick on purpose. Turquoise is noticeably lighter, more saturated, cooler than Dragon Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Turquoise is noticeably lighter, more saturated, cooler than Dragon Blue.
The same difference applies the other way round: Dragon Blue is noticeably darker, 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.
See Dragon Blue on the colour wheel See Turquoise on the colour wheel
All matches: Dragon Blue equivalents · Turquoise equivalents