PBA: I don’t think so. There are Poskim who mention that if you Daven one Mussaf Shmoneh Esrei for Shabbos and one for Yom Tov that you are Yotzei (though I don’t think it’s agreed upon by everybody). But if it’s in the same Shmoneh Esrei when you went back then you cancelled your first part, so you’re now missing Shabbos.
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