public static Comparison compareTwoResources(Resource right, Resource left) {
		IDiffProcessor diffProcessor = new DiffBuilder();
		IDiffEngine diffEngine = new DefaultDiffEngine(diffProcessor) {
			@Override
			protected FeatureFilter createFeatureFilter() {
				return new FeatureFilter() {
					@Override
					public boolean checkForOrderingChanges(EStructuralFeature feature) {
						return false;
					}				
				};
			}		
			
		};
		Function<EObject, String> nameFunction = new Function<EObject, String>() {
			public String apply(EObject input) {
				if (input instanceof NameElement) {
					return ((NameElement)input).getName();
				}
				// a null return here tells the match engine to fall back to the other matchers
				return null;
			}
		};		
		
		final IComparisonScope scope = new DefaultComparisonScope(right, left, null);
		
		IMatchEngine.Factory.Registry registry = EMFCompareRCPPlugin.getDefault().getMatchEngineFactoryRegistry();
		 /*
	       * configure our matching engine
	       */
		IEObjectMatcher fallBackMatcher = DefaultMatchEngine.createDefaultEObjectMatcher(UseIdentifiers.NEVER);
		IEObjectMatcher customIDMatcher = new IdentifierEObjectMatcher(fallBackMatcher, nameFunction);
		IComparisonFactory comparisonFactory = new DefaultComparisonFactory(new DefaultEqualityHelperFactory());
		final MatchEngineFactoryImpl matchEngineFactory = new MatchEngineFactoryImpl(customIDMatcher, comparisonFactory);
		matchEngineFactory.setRanking(20); // default engine ranking is 10, must be higher to override.
	    registry.add(matchEngineFactory);		
				
		return EMFCompare.builder().setMatchEngineFactoryRegistry(registry).setDiffEngine(diffEngine).build().compare(scope);
	}