The apple 'read aloud' feature is not the same as Kindle's text-to-speech: it is actually an audio track embedded in the ebook, and synchronizes with the text (highlighting the words as they are spoken). None of the Kindle formats support this.
Fire actually does have TTS (it's built in to the underlying Android system), but it doesn't work with the Fire's reading app. There are reading apps you can install that will use it (Mantano Reader for one).
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