Inman Line Ships

I am trying to identify a ship that sailed from England to North America in 1880. The Torkildson family I am investigating was to travel on the Inman line, sailing from Trondheim on the “Dampskib Tasso” on 14 Apr 1880, with an ultimate destination of Zumbrota, Minnesota. Naturalization papers indicate that the father entered the U.S. through Port Huron, Michigan in May, 1880, so they may have sailed to a Canadian port, not a U.S. port. The Norway-Heritage website indicates a 15 Apr sailing of the Tasso and lists two possible connecting Inman ships: 1) City of Berlin, which arrived in New York on 2 May, 1880 and 2) City of Montreal, arriving in New York on May 8. The S/S Montreal (Dominion Line) is listed as arriving in Quebec on 9 May, 1880. Three questions: Could the City of Montreal & the Montreal be the same vessel? If so, would they have different passenger lists? Can anyone provide the source for the article on the Tasso webpage that indicates two passengers died while being ferried out to the ship for the 15 Apr sailing? Thanks so much! Chris