And this press release: Υπουργείο Πολιτισμού και Αθλητισμού - Σημεία ενημέρωσης από την κ. Άννα Παναγιωταρέα και την Γ.Γ. κ. Λίνα Μενδώνη στην Αμφίπολη
I think this is pretty self-explanatory and the reconstruction shows how the head fits into the socket of the Sphinx, and how the wings were originally.
I am aware of a "leak" that's out there on the internet that a Nike statue was found. The reason people should ignore leaks is because ... when part of a wing was found last year, everyone assumed it was from a statue of Nike. When you hear hooves you think horses not zebras! But obviously further clarification has shown that the wing was from a
The head was originally carved separately and inserted into the socket to join the two pieces together - the technique is well known in sculpture and called "piecing" ... I am aware the head didn't look quite right on some fan made reconstructions, but there is no doubt that they fit together.
The right Sphinx faces forwards. It will be interesting to see if the left one does too, or if as on the throne it faces its pair.