The skull of Azhdarcho (Fig.1) is based on several disassociated parts from several individuals of various sizes. So, there’s a bit of estimation going on here.
The dentary (which matches the premaxilla) in dorsal view is narrower and pointier than in Quetzalcoatlus. Even so, there is no tooth at the tip, as in Bakonydraco and other eopteranodontids. The medially fused vomers extend to the premaxilla, which forms a very short part of the rostrum. The maxillary palatal shelves also fuse to the vomers.
The premaxilla and dentary need to align perfectly over a long distance from the glenoids, hence the precise cylindrical articulation at the quadrate/articular.
The portion of the skull just anterior to the antorbital fenestra rises considerably, distinct from Quetzalcoatlus.
As always, I encourage readers to see specimens, make observations and come to your own conclusions. Test. Test. And test again.
Evidence and support in the form of nexus, pdf and jpeg files will be sent to all who request additional data.
Averianov AO 2010. The osteology of Azhdarcho lancicollis Nessov 1984 (Pterosauria, Azhdarchidae) from the Late Cretaceous of Uzbekistan. Proceedings of the Zoological Institute RAS. 314(3):264–317.
Averianov AO 2013. Reconstruction of the neck of Azhdarcho lancicollis and lifestyle of azhdarchids (Pterosauria, Azhdarchidae). Paleontological Journal 47 (2): 203-209. DOI: 10.1134/S0031030113020020
Nesov LA1984. Upper Cretaceous pterosaurs and birds from Central Asia. Paleontologicheskii Zhurnal, 1984(1), 47-57.