Andreas, the 1/48 D.II seems to be the same kit.
If you look at the sprues in your posted Gavia review and compare them against the PDF form Special Hobby, you will find no difference. So fo me it looks like, that Special Hobby has taken over the injection die from Gavia (as lately seen with the Pfalz E.I), after Gavia was going out of the business.
Cheers,
Frank