Austria and Australia, certainly, but I don't think I've ever heard of Sweden and Switzerland being mistaken for eachother.
In Slavic languages its arguably somewhat close: - Russian: Швеция, Швейцария (translit: Shvetsiya, Shveytsariya). - Ukrainian: Швеція, Швейцарія (Shvetsiya, Shveytsariya) - Polish: Szwecja i Szwajcaria etc.
Romance languages, as well: - French: Suède, Suisse. - Italian: Svezia, Svizzera. - Spanish: Suecia, Suiza. - Catalan: Suècia, Suïssa. etc.