swap renderings

This PS script will, based on the paths and rendering id's provided, swap renderings and publish the affected items.

$pathsToChange = @(
    "master:/sitecore/path/to/page/1",
    "master:/sitecore/path/to/page/2",
    )

$defaultLayout = Get-LayoutDevice "Default"

$sourceRenderingId = "{00000000-0000-0000-0000-000000000000}" 
$targetRenderingId = "{00000000-0000-0000-0000-000000000000}"

foreach($path in $pathsToChange)
{
    $isUpdated = $false
    $item = Get-Item -Path $path

    $sourceRenderings = Get-Rendering -Item $item -Device $defaultLayout -FinalLayout |
        Where-Object { $_.ItemID -eq $sourceRenderingId }
        
    $targetRendering = Get-Item -Path "master:" -ID $targetRenderingId | New-Rendering

    # Replace all instances of the old rendering with the new rendering
    foreach($sourceRendering in $sourceRenderings) {
        Write-Output "Switching renderings...."
        $item | Switch-Rendering -Instance $sourceRendering -Device $defaultLayout -FinalLayout -NewRendering $targetRendering
        $isUpdated = $true
    }

    if($isUpdated)
    {
        Publish-Item -Id $item.ID -Recurse -PublishMode Full -Language '*' -RepublishAll -Verbose
    }
}