Version 6.5.0 ,when I use the Excerpt Include macro in a different page, It's not possible to list multiple used Excerpt macros created on that page.

Steps to reproduce:

1. Create a new page with 2 Excerpt sections
2. Create another page and use the Excerpt Include macro
3. You will notice that it only allows you to select a page title and you can't drill down to a specific excerpt.

Workaround

A 3rd part app MultiExcerpt provides the ability to define and use multiple Excerpt macros from a single page