It might be helpful to provide context for each conflicting chunk, as originally specified in our v2.2 mockup. This label should change dynamically whenever the radio buttons change.
This could be especially useful for screen readers.
- When neither column is selected, or in noscript mode, show "Please select a version".
- When "other" text is selected, show "Other version".
- When "your text is selected, show "Your version".