Question: Can an Eretz Yisroel resident receive an aliya when he is in chutz lo’oretz (because chutz lo’oretz are currently a sedrah behind Eretz Yisroel)?
Background:
When the eighth day of Pesach, or the second day of Shavous (in chutz lo’oretz), coincide with Shabbos, in Eretz Yisroel it is no longer Yom Tov (because, with the exception of Rosh Hashanna, in Eretz Yisroel only one day of Yom Tov is observed) and consequently there is regular Shabbos keriyas hatorah on this day (while in chutz lo’oretz it is still Yom Tov and the keriyas hatorah will be the Yom Tov keriya).
As a result of this, when this permutation occurs (i.e., when either the eighth day of Pesach or the second day of Shavous coincide with Shabbos) for several months the sedrah in chutz lo’oretz is one sedrah “behind” the sedrah in Eretz Yisroel.
Answer: Yes, a ben Eretz Yisroel can receive an aliya in chutz lo’oretz, despite the fact that a different sedra is being leined. This is because a ben Eretz Yisroel is also obligated in keriyas hatorah, and although Eretz Yisroel and chutz lo’oretz are reading different sedras, the intrinsic obligation of keriyas hatorah is incumbent on everyone (Yom Tov Sheni Kehilchoso Perek 12 Se’if 7).