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yes, there is a difference between the 2. even though both are octahedral in shape, d2sp3 hyb. usually occurs in complexes.
the important difference to notice is that in d2sp3 hyb compounds, the inner d orbitals are filled, before the s and p orbitals; whereas in sp3d2, the outer d orbitals are filled, after the s and p orbitals.
hope it was useful 
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