There are at least 7 different 3047 Head versions that we identify for parts. The differences are in the Handles, Quick Release Safety Locks and QR Receiver Styling.
The earilest versions have hard phenolic handles. As the versions progressed, the handles were made of rubber, variations in the rubber design are one of the small changes that do not effect the interchangableility.
The eariler versions did not have a safety that would prevent the quick release from being accidentally released. Later versions were redesigned with the lock. So, later version parts are not always backwards compatible.
Mostly due to added features, the shape and style changes over the years. Again, not always compatible.