To create a version comparison between documents using the same v1 document, follow these steps:
Create a new version workflow.
Upload all your version 2 documents in the create matter dialog.
Use the "+ Add Files" button to add your template or precedent document (v1) to the Version 2 column.
Click the blue Redlines buttons in the toolbar.
In the comparison panel, use the drop-down to change the "Original" document to Version 2 and the "Modified" document to Version 1 for all files.
Click Save to save your comparisons.