When you publish versions from the same space, Scroll Versions uses the Scroll Page ID on the specific pages to compare them.
When you compare spaces that aren't related to each other (master and published spaces), the report lists pages with the same titles as added in one space and removed in another. Vote and watch on the improvement to recognize pages from unrelated spaces by title:
VSN-4213
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Compare arbitrary space version to other space (published to other)
Closed