No there's isn't one. However, you can easily set one up using ContentEvents in CMS with very minimal code. 

[ModuleDependency(typeof(EPiServer.Web.InitializationModule))]
public class ChangeEventInitialization : IInitializableModule
{
    var oldFieldValue = "";
    public void Initialize(InitializationEngine context)
    {
        var events = ServiceLocator.Current.GetInstance<IContentEvents>();
        events.PublishingContent += Events_PublishingContent;
    }
    private void Events_PublishingContent(object sender, EPiServer.ContentEventArgs e)
    {
         // Fetch the currently published version
         var contentLoader = ServiceLocator.Current.GetInstance<IContentLoader>();
         var publishedVersionOfPage = contentLoader.Get<IContent>(e.Content.ContentLink);
        // You can then do something like if (e.Content is SitePageData pageData) to get the pageData/contentData for pages/blocks to get the new value
        // Compare old with new and send email accordingly (use try/catch and other techniques based on requirements)
    }
    public void Uninitialize(InitializationEngine context)
    {
        var events = ServiceLocator.Current.GetInstance<IContentEvents>();
        events.PublishingContent -= Events_PublishingContent;
    }
}

Thank you. I'm going to try implementing this as a proof of concept today.