No you can't use money from Sweden in Norway, different countries, different currencies.
The beautifull fjords in Norway are found in the west of the country, on the Atlantic coast. The most famous are Lysefjorden (google Kjeragbolten and Preikestolen for pictures) near Stavanger and Geirangerfjord (again google for pictures) near Ålesund.
I have only been to Geiranger and it is amazing. You can drive there from Oslo in a day and the drive itself is also very beatifull. Geiranger is also close to Jostedalsbreen glaicer and Jotunheimen national park. The glacier is Europes largest, but what you see at the base of it is not very impressive, the area is beautifull though. Jotunheimen is home to Norways highest mountains and offer great hiking.
As stated there are Archipelagoes in Sweden, wich are nice, but nowhere near as impressive as the norwegian fjords.