Norway and Sweden are virtually identical as far as I can tell. Though I haven't lived there, I work with norwegians and visit a few times a year since 2008.
Standard of living might be a bit higher, but not drastically.
Naturally, Salaries are a lot lower in Sweden, but so are the prices. Food prices in Norway are often double, rarely less than 150%.
One interesting detail is infrastructure. Due to all the mountains and fjords, building highways in Norway is super expensive. Lots of tunnels. Smaller roads tend to follow the natural, winding shape of the land, making them slow and long.