The only time I saw the mini-optical connector was on a portable DVD player. The mini-jack allowed either an analog stereo mini connector (as for headphones) or the optical connector. Aside from that, I have never come across them. I doubt they are standard on any fullsize equipment. But I certainly see why they are interesting for portable devices: one jack fits two needs.
Oh, and to answer your question: the digital signal is the same regardless of the connector. You would use the mini-connector to toslink adapter if you wanted to hook it up to your receiver. Currently, I don't see why you would ever need a mini-optical to mini-optical adapter... Maybe someone can enlighten me.
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