Feeding seperately (ie in different rooms) at timed intervals is your best bet, however if this is not feasible, then stick both on the kitten food, the biggest problem for the 1 yr old cat is that it may gain a bit too much weight, but it is better than the kitten not getting enough. The additional protien will just be converted to carbs. At a year old it won't be a disaster as the older cat should still have enough "kitten" in him/her to burn it off. An older cat's kidneys would have a harder time processing all the protein waste, which is why you should watch more mature animals around kitten/puppy food.
Good luck!
Michelle
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