Сравниваем свойства говна и мочи
function Diff-Properties {param ([PSObject] $mocha, [PSObject] $govno)
   $differences = @()
   $propertiesM = $mocha | gm -MemberType NoteProperty,Property | % Name
   $propertiesG = $govno | gm -MemberType NoteProperty,Property | % Name
   $allProperties = ($propertiesM + $propertiesG) | select -Unique
   foreach ($prop in $allProperties)
   {
       $difference = diff $mocha $govno -Property $prop
       if ($difference -ne $null)
       {
           $differences += New-Object -TypeName PSObject -Property @{PropertyName=$prop;ValueA=$mocha.$prop;ValueB=$govno.$prop}
       }
   }
   return $differences
}

Работает так:
$M = New-Object -TypeName PSObject -Property @{Color="Yellow";Type="Liquid substance";Smell="Good";Volume="One glass"}
$G = New-Object -TypeName PSObject -Property @{Color="Brown";Type="Solid material";Smell="Good";Mass="250 grams"}
Diff-Properties $M $G | ft PropertyName,ValueA,ValueB
PropertyName ValueA           ValueB        
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