You can use the "VMware Product Interoperability Matrixes" to check compatibilty. See the attached screenshot on which you can see that running the ESXi 5.1 tools on ESXi 5.0 hosts is supported. You can find the "VMware Product Interoperability Matrixes" at: http://partnerweb.vmware.com/comp_guide2/sim/interop_matrix.php
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