I don't think you can rely on it. My take is it depends on the Trigger condition. How can you be 100% sure that the indexes are changed in the order you want? What if the indexes were modified in such a way that the 4th Triggered but 1, 2, and 3 had not because they did not meet the Trigger conditions?
Now perhaps you have that all planned out where that cannot happen, so the answer to the question is each time an AIX is triggered it goes in to the Task Process list. This is a fifo list. Theoretically, task 1 will be processed before task 2. But if for some reason task 1 cannot be processed it will be flagged for retry and task 2 executed. Also consider that the process may be multi-threaded and will grab several tasks at a time.
As I said, I would not rely on it.
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