If someone is from Eretz Yisrael and is visiting America while the parshios are not the same. Can one get an Aliyah?
Please source your arguments
As concerns public Torah readings, one does not have a personal parsha, rather, the congregation does. The Shulchan Aruch HaRav website brings the following:
Traveling from Israel -
Kerias Hatorah for Ben Eretz Yisrael in Chutz Laaretz when Parshiyos are not aligned: If one traveled from Eretz Yisrael to the Diaspora in a week that Eretz Yisrael is one Parsha ahead of the Diaspora, as occurs in certain years starting from the Shabbos after Pesach or the Shabbos after Shavuos, and thus in the Diaspora they will repeat the reading that he heard in Eretz Yisrael, then he is obligated to hear the Parsha a second time.
Shnayim Mikra: If one traveled from Eretz Yisrael to the Diaspora in a week that the Diaspora is reading the Parsha that was read the previous Shabbos in Eretz Yisrael he is not required to repeat Shnayim Mikra of that Parsha , even though he is required to hear the reading of the Torah.
Aliyos: There is no issue with a Ben Eretz Yisrael getting an Aliyah to the Torah, even though he is holding by the next Parsha.
Chitas: If one traveled from Eretz Yisrael in a week that Eretz Yisrael is reading a different Parsha than the Diaspora, then on the day of arrival he is to stop learning the Chumash with Rashi for his Parsha, and study the Chumash with Rashi for the Parsha of Eretz Yisrael, until that days Aliyah."