I didn't say it was accurate. Given the difference in human heads, they must have intended a distinct individual, not two renditions of Vlad III Draculea (which is what they would have ended up with, if you go with the Wallachian coat of arms). Moreover, this Wallachian coat of arms may be too late a version to have employed here (an earlier one, used by his grandfather, was a lion, while I see this one with the bird, cross, star, and crescent used in the following century; there is also a third, distinct coat of arms for this branch of the Wallachian Basarab family, supposedly going back to his time but I'm not sure that is verifiable) -- apart from possibly being mistaken as a reference to a crow personal device of the Hungarian king. The presence of identical (but differently executed) dragon imagery on their shields already betrayed a conflation. They ought to have done their homework better, and it would not be the first time. These are largely fantasy figures and designs, only very loosely based on their sources for inspiration. As for the contacts, alliances (including marital ones), cooperation, and betrayals between the Wallachian and Hungarian rulers, they are well documented.