It really does not look like any of the Castles Frankenstein depicted in the classic movies. FRANKENSTEIN/BRIDE OF FRANKENSTEIN don't even really feature a castle, but an abandoned tower where Frankenstein conducts his experiments:
SON OF FRANKENSTEIN went more stylized:
GHOST OF FRANKENSTEIN:
FRANKENSTEIN MEETS THE WOLF MAN:
Given that there was never a consistent look, it makes sense that Universal might want to create a new design for the land. I just wish it didn't look like they took some of the same elements from Hogwarts (the large, pointed "sorcerer's hat" turret and the flat-faced section leading to a point and flanked by smaller turrets) and slightly reoriented them. But maybe it's just a placeholder exterior.