Try the union tool http://resources.arcgis.com/en/help/main/10.1/index.html#//00080000000s000000
Thanks for replying, Luke. The Union tool merges the two feature sets, but I want to highlight the differences, not obscure them. I also tried the Symmetrical Difference tool, but that only outputs the collective differences between the entire data sets. I want to know where and how each feature has changed between sets. Hopefully, this intent comes through in the diagram I linked.