From what I understand... the first set is the style number and the second set is some sort of date code. Whether or not two bags can have identical numbers if they are the same style that were made at the same time, I don't know. I know that this is possible for LV or Coach... so I suppose its possible.
Sorry I can't be of more help. Can you post pics of the bags? That might help us out more.
What worries me is your "reputable" wholesaler. Although Gucci does sell off overstocks, very rarely can the general public purchase these.