I would not assume that a certain type of backhaul would meet Sprint's requirements just because it met VZW's requirements. Sprint's and VZW's deployments are not really comparable.
VZW is not overhauling its network. Rather, VZW is just overlaying a single 10 MHz FDD LTE carrier (using older LTE equipment, I might add). So, VZW requires backhaul to support only that one LTE carrier. Moreover, VZW has never promised to have sufficient backhaul at every one of its LTE sites, so some could even be backhaul limited.
AJ