ESX vs vSphere data discrepancy

Hi,

We use VMWare and vSphere and have LM configured to poll the vSphere clusters to get the data such as VM Performance.  We then looked at the various ESX modules vs vSphere modules to see what was different.   When we looked at the ESXi Modules, there is a disclaimer on them that says:

By default this module is disabled due to monitoring the same metrics as VMware_vSphere_VirtualMachinePerformance.

We turned on the VMware_ESXi_VirtualMachinePerformance module and compared that to the data in the VMware_vSphere_VirtualMachinePerformance module and assumed we'd see similar information.  However, the information is actually very different.

Does anyone know how these work and why the information that says it's the same would actually not be?