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.
There are never any guarantees with a combine, but they will do as well as Italians with Italians etc. I have rarely seen a newspaper combine fight, but I have seen it happen once and it was not pretty. But odds are just as good.
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