Can a Sefardi be Yotzeh Zachor with an Ashkenazi Laining and vice Versa?
Rav Moshe Feinstein writes that all ethnic pronunciations of Hebrew are equally acceptable, even for chalitza which requires the reading of specific Hebrew verses. I'd assume the same would apply here, according to him.
My LOR/P told me that I can be yotze with Ashkenazim as long as the reader differentiates between ע and א and between ח and כ (which was the case in my situation).
Yalkut Yosef (685:12) says Bediavad he is Yose - ומכל מקום אם שומע את קריאת פרשת זכור במבטא אשכנזי, ומתוך ספר תורה בכתב אשכנזי, יצאו ידי חובה.
And also, later on he says an Ashkenazi is also Yose from a Sefaradi.
My friend had it from R Dovid Feinstein that one should look for a reader with his own havarah. In this case the koreh used Israeli, and my friend used sav and komotz.