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I wouldn't run at all between the two, swim or cycle to keep active. Its more than doable (I have done this more than once) as long as you don't try to race both, it doesn't matter which one you chose to race as long as you treat the other as a training run. Of course it does all depend on how used you are to running long distances and the number of long runs you have done in training for these two events.
LOL @ 'ran on a curry' Good luck for both your races!