Sometimes you might find it convenient for two fancy pages to share the same module. After all, nothing stops you from constructing two objects that subclass fancy pages inside a single module's constructor function. However, there's a catch: they would both render the same pageSettings.html and load the same editor.js and content.js.
You can address this by passing these options to the fancy pages constructor:
pageSettingsTemplate: 'indexPageSettings',
editorScript: 'indexEditor',
contentScript: 'indexContent'
The apostrophe-blog-2 module relies on this approach and can be referred to as a reference on this technique.