REG COMPARE KeyName1 KeyName2 /v ValueName | /ve Output /s KeyName \Machine\]FullKey Machine Name of remote machine - omitting ...

REG COMPARE KeyName1 KeyName2 [/v ValueName | /ve] [Output] [/s]

  KeyName    [\\Machine\]FullKey
    Machine  Name of remote machine - omitting defaults to the current machine.
             Only HKLM and HKU are available on remote machines.
    FullKey  ROOTKEY\SubKey
             If FullKey2 is not specified, FullKey2 is the same as FullKey1.
    ROOTKEY  [ HKLM | HKCU | HKCR | HKU | HKCC ]
    SubKey   The full name of a registry key under the selected ROOTKEY.

  ValueName  The value name, under the selected Key, to compare.
             When omitted, all values under the Key are compared.

  /ve        compare the value of empty value name (Default).

  /s         Compare all subkeys and values.

  Output     [/oa | /od | /os | /on]
             When omitted, output only differences.
    /oa      Output all of differences and matches.
    /od      Output only differences.
    /os      Output only matches.
    /on      No output.