I do not think there is a difference between the two I think they represent the same things and are portrayed in the same ways. I think the viewing and perception changes over time and possibly becomes more accepted...

Blaxploitation in the 70's is/was a hot button issue because of the civil right fight had peaked in the 50/60/70's this vision of African American media was possibly look upon as racist and not what an African American should strive for. An insult...

As time went on and issues "mellowed" and the blaxploitation I FEEL were accepted by the black community and turned in gangsta films. The stereotypes were embraced viewed as African American Hollywood relating to their situation. These gangsta films were typically a way out of poverty for the African American, while one of the differences could be that in blaxploitation the African American was not seen as successful in their work. In the gangsta films they were rich, making something of themselves, and a way out of their current low class community.