According to this site, they are two commonly confused types. That site has tips for distinguishing them.
At first I thought my grandfather was an ENTJ. He cuts an imposing figure and seemed to have a vision for what his family should be. He used to go around saying "I'm an intelligent black man! Don't talk that nonsense with me!" He is driven and seemed ambitious.
But he's clearly an ESTP, as my brother helped me realize. He's led a wild and crazy life. I mean, he was blinded in a barfight. Women are his biggest weakness. He has been extremely violent to get his way. Yet he is super charming and can be very generous with money. He is definitely a risktaker and a gambler as well.