All leaders perform management functions, but very few managers actually perform leadership functions.
We had an incident recently where 2 people could not behave themselves like adults in a particular setting at work. Instead of dealing with the 2, and making sure they don’t do it again, our management team (note I didn’t say leaders) decided to make a list of archaic rules for that setting, which means that for the bulk of us, who’ve been able to behave ourselves in the same setting for the past 6 years, we now have to conform to the same set of rules. That’s management. Managers deal with a difficult situation in general, they can’t take it head on and resolve it. Leaders get out of their comfort zone, and take it head one, dealing with the cause, not the symptoms.