When diffing the two blueprints, the FText values are deemed different when they are the same. A workaround has been found by doing a pure string-compare for FText inside "GraphDiffControl::ArePinsDifferent." (More in the attached UDN's URL).
Results: The source control version shows a diff between the FText pins even though they are the same.
Expected: No diff to be shown when the FText values are the same and the source control version and blueprint being diff'ed to have the same key values.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-80466 in the post.