Those two seem to both have the same starter and fuel tank, but very different air filter housings, top covers and mufflers (all of which are simply bolt-on bits). It would be interesting to gather and compare some identifications from the cylinder/crankcase and cylinder head castings. Some of them would probably be on die inserts and therefore label-specific, but some may be fixed parts of the gravity-casting die, and therefore would be unique to the actual manufacturer.
