The REG COMPARE command.

REG.EXE, built into Windows XP, Windows Server 2003, and later operating systems, or installed from the Windows 2000 Support Tools, has a COMPARE command.

When you type: REG COMPARE /?, you receive:

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 
  /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

Return Code:

  0 - Succussful, the result compared is identical
  1 - Failed
  2 - Successful, the result compared is different

Examples:

  REG COMPARE HKLM\Software\MyCo\MyApp HKLM\Software\MyCo\SaveMyApp
    Compares all values under the key MyApp with SaveMyApp

  REG COMPARE HKLM\Software\MyCo HKLM\Software\MyCo1 /v Version
    Compares the value Version under the key MyCo and MyCo1

  REG COMPARE \\ZODIAC\HKLM\Software\MyCo \\. /s
    Compares all subkeys and values under HKLM\Software\MyCo on ZODIAC
    with the same key on the current machine

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