Scripts/Helpers/Confirm-PolicyDefinitionsMatch.ps1

function Confirm-PolicyDefinitionsMatch {
    [CmdletBinding()]
    param (
        $Object1,
        $Object2
    )

    if ($null -eq $Object1) {
        # $Object2 is not $null (always true); swap object 1 and object2, so that $Object1 is always not $null
        $tempObject = $Object2
        $Object2 = $Object1
        $Object1 = $tempObject
    }
    $type1 = $Object1.GetType()
    $typeName1 = $type1.Name
    $type2 = $null
    $typeName2 = "null"
    if ($null -ne $Object2) {
        $type2 = $Object2.GetType()
        $typeName2 = $type2.Name
    }
    if ($typeName1 -in @( "Object[]", "ArrayList") -or $typeName2 -in @( "Object[]", "ArrayList")) {
        if ($null -eq $Object2) {
            return $Object1.Count -eq 0
        }
        else {
            if ($typeName1 -notin @( "Object[]", "ArrayList")) {
                # convert single element $Object1 into an array
                $Object1 = @( $Object1 )
            }
            if ($typeName2 -notin @( "Object[]", "ArrayList")) {
                # convert single element $Object2 into an array
                $Object2 = @( $Object2 )
            }
            # both objects are now of type array or ArrayList
            if ($Object1.Count -ne $Object2.Count) {
                return $false
            }
            else {
                # iterate and recurse
                $object2List = [System.Collections.ArrayList]::new($Object2)
                foreach ($item1 in $Object1) {
                    $foundMatch = $false
                    for ($i = 0; $i -lt $object2List.Count; $i++) {
                        $item2 = $object2List[$i]
                        if ($item1 -eq $item2) {
                            $foundMatch = $true
                            $null = $object2List.RemoveAt($i)
                            break
                        }
                        else {
                            $policyDefinitionReferenceIdMatches = $item1.policyDefinitionReferenceId -eq $item2.policyDefinitionReferenceId
                            $policyDefinitionIdMatches = $item1.policyDefinitionId -eq $item2.policyDefinitionId
                            $parametersMatch = Confirm-PolicyDefinitionsParametersMatch $item1.parameters $item2.parameters
                            $groupNamesMatch = Confirm-ObjectValueEqualityDeep $item1.groupNames $item2.groupNames
                            $foundMatch = $policyDefinitionReferenceIdMatches -and $policyDefinitionIdMatches -and $parametersMatch -and $groupNamesMatch
                            if ($foundMatch) {
                                $foundMatch = $true
                                $object2List.RemoveAt($i)
                                break
                            }
                        }
                        if (!$foundMatch) {
                            return $false
                        }
                    }
                }
                return $true
            }
        }
    }
}