Maledictions Stack?

So this came up in one of the games I had with Mark the other day. If you have multiple of the same Malediction from different psykers can you cast them on the same unit and have them stack? The line that confuses me is this "Note that bonuses and penalties from different maledictions are always cumulative, but cannot, unless otherwise stated take characteristics above 10 or below 1" (emphasis mine). The word different is what throws me. Thinking about it since the same psyker cannot cast the same power twice I would hazard they had intended for the same power from different psykers to be unable to stack. But you could stack two absolutely different named powers and have them stack.