Relativity Compare Field
Relativity 9.4 includes a compare field that can be used to create redlined versions of two different documents.
The compare field is added as a separate field to a view.
You click on the compare icon in the field, and then when the Document Compare window opens you need to click the ellipsis on upper right select the second document. Click 'Compare'.
The text in black is what the two documents have in common, the red text what is omitted in the second, and the blue text is what is unique to the second.