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We have a measure that we use internally for this purpose. I just posted ReportModelChanges to BCL. In our case we often use measures to create the model in which all of the handles/UUID's are different, making a text editor tough to use. @MatthewSteen's suggestion of looking at the out.idf is one good option, but we wanted something to specifically look at OSM's

While this measure doesn't alter your model, it runs as a "Model" vs. "Reporting" measure since it only needs model inputs vs. model outputs. As a result you can use it in with "Apply Measures Now". The resulting info message has a link to an HTML file that looks something like what is shown below. There are three sections.

1. Objects Only In Model
2. Objects Only In Comparison Model
3. Objects In Both Models With Differences

Below is a screenshot of the third section. Items where there is a difference are highlighted in red.