$SourceDocs = Get-ChildItem -Recurse –Path "\\172.16.97.19\c$\Program Files\Folder to Check\" | foreach  {Get-FileHash –Path $_.FullName}
$DestDocs = Get-ChildItem -Recurse –Path "C:\Program Files\Program Files\Folder to Check\" | foreach  {Get-FileHash –Path $_.FullName}

(Compare-Object -ReferenceObject $SourceDocs -DifferenceObject $DestDocs -Property hash -PassThru).Path