if there's a flow goind on it's less likely, but i think you're talking about "sister" hives robbing each other..as much likely as any other hive, only that splits are more vunreable to being robbed. usualy when a hive is being robbed it's robbed by all the other hives.
robbing is usually caused by the beek and not the bees, so if you do "by the book" there's a smaller chance of getting robbed out bees