Inherently? Of course not.

[ He needn't have been afraid. Byerly's answer is unhesitating, as certain as he would be if he were commenting on the salinity of the sea. ]

The only true difference - aside from the education afforded to nobles, of course - is that bloodlines come with certain reputations. And power comes from belief. If people believe you can lead, they follow. But those sorts of tales don't belong to nobles alone - King Calenhad himself came from common stock. Do you think there's a difference between them?