Preston,
I'm not sure either but it may be similar.  Sweepstakes are usually limited to puppies under 18 months of age and there is a separate entry fee which is divided among the puppies that place after expenses are taken out.  Regular AKC Breed judges cannot judge a Sweepstakes in a Breed for which they are approved.  While different clubs do it differently, generally there is a Best In Sweepstakes, Best Of Opposite Sex Sweepstakes and may be a Best Junior Dog, Best Senior Dog and the same for the bitches.  The winners get a very nice rosette and a proportionate split of the pot.  Sweepstakes do not count toward accumulating Championship points.
Jim