ΔE 8.7, close: similar, with a visible difference side by side. Blue Green is a little lighter than Dark Turquoise.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Blue Green is a little lighter than Dark Turquoise.
The same difference applies the other way round: Dark Turquoise is a little darker.
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 Dark Turquoise on the colour wheel See Blue Green on the colour wheel
All matches: Dark Turquoise equivalents · Blue Green equivalents