Most features from WinForms control are available in WPF version too - node types, automatic layouts,  import / export classes, controls like Overview and Ruler, etc. If your application uses CompositeNode with its XML templates, you'd need to replace these with TemplatedNode and Xaml. And there are platform differences where the diagramming API now uses WPF's own styles, brushes, text formatting types instead of System.Drawing ones.

Regards,
Slavcho
Mindfusion