I know some foods are rated for both. For example, blue bag original Cat Chow is rated for all stages of a cats life (if memory serves). You might want to check the AAFCO code on the bags to see what they are rated for and try to find a compromise amongst the food options.
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Tammy
(Stanley 8/91 - 8/07)
(Pookey 8/91 - 11/10)