Ashkenaz/Sefard

According to Harav Hagaon Reb  Shlom Zalman Auerbach zt”l:

Ashkenazi Kohanim in Chutz La’aretz should Lekatchila not Daven in a Sephardic Minyan (Shachris) so not to get into a situation of having to  Duchen. (when Minhag Ashkenaz is not to Duchen)

R' Shlomo Zalmen also holds, an Israeli Kohen who happens to be in Chu”l may Daven and Duchan Lekatchila in a Sephardic Minyan.

Birchas Kohanim