I highly advise watching the movie first since the series takes place after the events of the movie's ending. And yes, they have different actors/actresses in both the show and movie, so don't be alarmed once you notice that detail
There's no "reverse racism" on white people, because POC don't have societal bestowed power in the situation. If a POC stereotypes you by your skin color, they are being racially prejudice, not racist.
Find more tv shows like Dear White People to watch, Latest Dear White People Trailer, At a predominantly white Ivy League college, a diverse group of students navigate various forms of racial and other types of discrimination.
Dear White People - Justin Simien 2014 -- "About a group of African-American students as they navigate campus life & racial boundaries at a predominately white college. A sly, provocative satire about being a black face in a white place.
Dear White People stars Marque Richardson, Logan Browning, and John Patrick Amedori