File file1 = new File("EMFModelA.ecore");
File file2 = new File("EMFModelB.ecore");

//register XMI resource factory for all other extensions
Resource.Factory.Registry.INSTANCE.getExtensionToFactoryMap(
).put(Resource.Factory.Registry.DEFAULT_EXTENSION,
new XMIResourceFactoryImpl());

ResourceSet resourceSet1 = new ResourceSetImpl();
ResourceSet resourceSet2 = new ResourceSetImpl();

//Loading resources
EObject model1 = ModelUtils.load(file1, resourceSet1);
EObject model2 = ModelUtils.load(file2, resourceSet2);

IComparisonScope scope = EMFCompare.createDefaultScope(resourceSet1, resourceSet2);
Comparison result = EMFCompare.builder().build().compare(scope);

Iterator<Diff> it = result.getDifferences().iterator();
while (it.hasNext()){ 
System.out.println(it.next());
}