Jana Sattainathan shows how to use Powershell to compare Active Directory group membership for two users:
Before we begin, if you are running Windows 7 or if you do not have the Active Directory module installed, please do so first by downloading and installing “Remote Server Administration Tools”. I personally cannot live without this module.
Let us call the new employee as NEW_USER and the existing employee as OLD_USER. Here is how to use PowerShell to do the comparison.
The retrieval and comparison code is pretty easy; click through to see.