What is the difference between Micro USB part numbers UB-MC5BR3-SD204-4S NMP, UB-MC5ABR3-SD204-4S NMP and UB-MC5BR3-SD204-4S-1 NMP, UB-MC5ABR3-SD204-4S-1 NMP?

The difference is a revision to the shape by adding a stopper in order to reduce the occurrence of cracking in the colder tails when excessive force is applied by the user from the mating plug.
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