Comparing Files in two Document Libraries with PowerShell

Hi mwilliams71 

Here it is an example assuming only one site, please adapt and test because you want to compare a stream

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Variables for Processing
$SourceWebURL = "https://Your-Source-Web-URL"
$SourceLibrary ="Team Docs"
$TargetLibrary = "Shared Documents"

$ColumnToCompare="Your Compare Column Name"
 
$Web = Get-SPWeb $SourceWebURL
$ListOne = $web.lists[$SourceLibrary]
$ListTwo = $web.lists[$TargetLibrary]
 
$ListOneValues = @()
$ListTwoValues = @()
 
$ListOne.Items| foreach { $ListOneValues+= $_[$ColumnToCompare] }
$ListTwo.Items | foreach { $ListTwoValues+= $_[$ColumnToCompare] }
 
Compare-Object $ListOneValues $ListTwoValues