Moderation Tab -> Revisions and Compare revisions links -> Revisions treated as administrative page, Compare revisions is not.

Workbench Moderation 7.x-1.3
Diff 7.x-3.2
When selecting the Moderation tab, and then clicking Compare revisions, the non-administrative theme is used, even if configuring the Diff module to treat as administrative. Clicking Compare will also use the non-administrative theme. Clicking Previous difference, Standard, or Marked down switch into the administrative theme.

The URLs generated for the non-administrative theme are:
Compare revisions: node/%node/moderation/diff
Compare button: node/%node/moderation/diff/view/rev#/rev#

The URLs generated for the administrative theme are:
Previous difference: node/%node/revisions/view/rev#/rev#
Standard: node/%node/revisions/view/rev#/rev#/raw
Marked down: node/%node/revisions/view/rev#/rev#

This is probably because of newer changes in the Diff module not being reflected in the older Workbench Moderation module when it copies over the Diff pages. Anyone solve this yet with a patch?