Yehoshua ben Yehotsadak, and Yeshua ben Yotsadak are the same person. He was the High Priest at the time of the rebuilding of the Temple and together with Zerubavel led the people who returned to Israel from Babylon. Spelling changes occur quite often in the Bible. The spelling Yeshua (without the hey) is in the books Ezra and Nehemia, while the other spelling [with the hey] is in Hagai Zecharia and Divrei Hayamim.
A devious plan by modern day Jewish prayer books to acknowledge that Jews have always prayed to Yeshua? Or is it simply that a word in old Rosh Hoshana Machzor (prayer book for Rosh Hoshana) has been subject to Christian censorship and is now indeterminable? Perhaps there is another explanation? Here is just one possibility: