You can launch a comparison of your model with another model of the same type at any time.
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Select to open the Select Models to Compare dialog box.
The current model is displayed in the Model 2 field.
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Select a model to compare in the Model 1 list. Only models of the same type in the workspace are available for comparison.

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[optional] Click the Options button to open the Comparison Options window and specify which objects and properties you want to include in the comparison. For more information, see Comparison options.
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Click OK.
The Compare Models window opens. See Analyzing differences in the Compare Models window.