If you thought the new XPS model names have become too confusing, you're not the only one. Dell will be returning to the XPS 9xxx naming convention again after experimenting with the XPS 7xxx to make it easier for consumers to understand.
https://www.notebookcheck.net/How-did-we-jump-from-the-XPS-13-9380-to-the-XPS-13-7390-and-XPS-13-9300-Dell-explains.447862.0.html