Is there a difference between VSphere Management API 5.0.0 and 5.1?

Hi,

I have coded against the VMware-vSphere-SDK-5.0.0-429209 API version, but now have a production environment telling me to be an ESXi 5.0.0 804277 (vCenter Server).

Can I access the ESXi Version with VMware-vSphere-SDK-5.0.0-429209 API version?

Do I have to watch for some differences when accessing MIB objects?

Thanks, Lothar