Yes- first, create a new web app template that uses the swipe tool. Make that public and get the link for it. Inside your Cascade Story Map, add an immersive slide and then use the option to specify a URL. Paste the URL that you copied for the swipe tool web map app. If you'd like you can append "&embed" at the end of the swipe app URL to give a more seamless integration into your Cascade story map.