Differences between MultiExcerpt & Multiple excerpts (Atlassian's tool)

allows you to have content in a field and share that in multiple places in your confluence

allows you to select one excerpt from the list of excerpts

allows you to pick the format (inline or block)

can contain text, images, Informational boxes, Flow Boards, JIRA issues, and more

can be across spaces

case sensitive

Fallback permission handling

content viewable prior to publishing