Jonas Gaard

I am a member of a group of 4 who are researching our ancestors; the Gaard family from Talgje, Finnøy, Rogaland, Norway. We are having a problem understanding information about Jonas Gaard, son of Sjur Larson and Ingeborg Oddsdatter. He is the brother of our g-g-grandparents (Rakel, Severt and Louis). We have a parish birth record for Jonas for 19 Jun 1848 in Randaberg, Hetland, Rogaland, Norway. It lists the father as Sivert Larsen - Is this the same person as Sjur Larsen. Then we find a parish emigration record for Jonas for 24 Aug 1869 which lists his name as Jonas Sjursen Gaard age 21 going to North America. Another place it shows him on a Canadian Passenger List as Jonas Sivertsen Gaard arriving on the ship Heros in Quebec, Canada in Jun 1869 at age 20. Then there is another Canadian Passenger List showing Jonas Sjursen arriving in Quebec on 21 Jun 1874 at age 26. Are there any records to help us with correct information. We appreciate any help you can give us.