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Sc., "and yet not quite the same": thus, she expresses doubt - and doubt is the first step in all spiritual progress. She realizes that the "altered throne" is outwardly the same as that which she has left behind; but she percieves intuitively that it is imbued witha spiritual quality which the other did not possess, and which she cannot quite yet understand.
Thus Tabari, Zamakhshari and Ibn Kathir, on whose interpretation of this passage my rendering and the above interpolation are based.
Because he had refused her tribute.
Bringing her well-guarded, mighty throne all the way from Sheba, Yemen.
Bilqis stands the test. She knows it was her throne, yet not exactly the same, for it was now much better. And she is proud of her good fortune, and acknowledges, for herself and her people, with gratitude, the light which was given to them by Allah, by which they recognised Allah's prophet in Solomon, and received the true Religion with all their will and heart and soul.