Some big differences between China and the US:
(1)They will not care about being called racist or imperialist
(2)They will not hesitate to use force if some African despot tries to nationalize their assets or kill their people
(3)They have no need for Africans. They have plenty of Chinese to do the work
The net result of Chinese colonization of Africa might just resemble the British colonization of North America (which didn't work out well for the Native Americans)
“The net result of Chinese colonization of Africa might just resemble the British colonization of North America (which didn’t work out well for the Native Americans)”
It might net out more like the Spanish colonization of South America.
Of course, that didn’t work out perfectly for Native Americans, either.