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Hi Habib, of the two diets you listed, only the Tiki Cat diet would be considered nutritionally appropriate, as it is specifically formulated for kittens. The Royal Canin diet is formulated only for adult cats. Kittens and adult cats do have separately recognized nutritonal needs, and diets that carry the AAFCO statement on them, will say they are approved for one or the other of those life stages. There are also all life stages diets which have their own benefits and detractors.
Now, that’s not to say that the Royal Canin wouldn’t be an appropriate choice in the future. Close to a year of age, if a cat is on a kitten specific formulation, they would need to be transitioned to an adult life stage diet.