Of course they aren't the same person. Just as Matthias was not the same person as Judas. After Christ's death more Aposltes were called.
Acts 1: 23, 26 23 And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias. • • • 26 And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.
The Apostles today are called in the same manner as those of the Bible. By revelation from God, by the laying on of hands by those who have the priesthood authority and keys.
The further implication being that the Urim and Thummim could be used today as they were in Bible times which is false. The Urim and Thummim were part of a now-defunct sacricial system.
The Urim-Thummim-spectacle thing is one of Joe Smith's quirkier contentions though he did have his large share of them.