It's actually Carniolan, not Carniolian. Must be a typo.
Yes, all strains/subspecies of Apis mellifera can live together in the same hive, as long as they are introduced to each other in an appropriate way (that appropriate introduction can be done in various ways).
An exception I would make to my above statement is that I would not include the cape bee (Apis mellifera capensis), in any combine. Hopefully they still have limited distribution.