In some countries like the UK for example, it's a well documented phenomenon that men in nursing rise to senior positions in disproportionate numbers. Some of that is attributed to larger numbers of female nurses often having to downgrade when they return from maternity leave if they reduce to part time hours, careers being put "on hold" to raise families in a way that few men ever have to do.
I'm a CNA, so don't have any personal experience with this. I will say that I know a male RN at my work who just got promoted to a manager, not two months after he finished his orientation. He was fresh out of nursing school too.
although nursing work doesn't discriminate on gender regarding easy or hard work. men in management or even higher positions in nursing are well represented in several departments where i work. therefore, in answer to your question "no is not harder" is just dedication, determination, and dependability to move up the ladder to achieve those positions.