The two assemblies being compared have different members 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Remarks
 This difference means that there is a member of the first assembly which is different from the corresponding member of the second assembly. Details about the difference are in memberDifference. 
 Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB AssemblyDifference
Autodesk.Revit.DB AssemblyDifferenceMemberDifference
 
 Autodesk.Revit.DB AssemblyDifference
Autodesk.Revit.DB AssemblyDifferenceMemberDifference