Personally I don't have experience synchronizing local user information, but after some research I'm not 100% sure you can synchronize those types of properties. If you look in the Operations Manager Guide on page 175 (Snapshot Storage), it states that for local users, only the user name, full name, and description are captured and stored in the database.
While an audit may report that there are differences between other local user properties, you might only be able to synchronize the itmes listed in the Snapshot Storage chart referenced above.
Again I am not 100% sure this chart directly correlates to what you can synchronize, but I believe this is the case. Does anyone else know?
Support has informed me that this has been reproduced in-house and is a regression. Ticket 8578 has been logged.