How does postcolonial theory differ from Marxism?, English homework help

Two major modes of cultural criticism are Marxism and postcolonial theory. Lynn describes Marxist theory on p.154 as follows: Marxist criticism strives to see literature regarding its relationship to society, and work is assumed to reinforce the current social structure, or undermine it, or some combination of the two (2011). How does postcolonial theory differ from this? In what ways is it similar? Support your assertions with clear reasoning and examples.