Pretty much. Pachycephalosaurus was already done in Dragon Magazine, so I took my (weaker) creature, gave it an extra power, and refluffed. From all the information I could find, it seemed that Dracorex was a weaker version of Pachycephalosaurus, anyway.
EDIT: 100 posts! And, once Kosmocratops is completed, we will have the same amount of dinosaur species as Isla Sorna and Isla Nublar combined!