The basic frames of these two bikes appear to be the same. The Lusso has more 'stuff' (racks, different fenders, etc.) on it. The 'stuff' has a tendency to break off or come loose, which poses additional problems ---- but it sure looks good!
I have an off-set intake manifold on mine that eases any fitment issues, though with the Cranbrooks there probably won't be an issue.
Best of luck on your continued adventures!!