Both are located at the resource management layer of the converged resource pool solution. FusionManager is earlier than FusionSphere OpenStack.
Currently, FusionSphere OpenStack is used in cloud data center scenarios, and FusionManager is used in server virtualization scenarios. The reason is that FusionSphere OpenStack can connect to and manage more resources in the south interface , not only in terms of quantity but also in compatibility with vendors and devices.