It appears people are forgetting or retroactively changing the justifications already. The lockdowns were meant to reduce deaths by ensuring everyone who got infected could get healthcare. In Sweden that is the case despite having been much less severe than other countries. Thus, their approach is de facto more successful than elsewhere.
Comparing to their direct neighbours is thus irrelevant, because a total reduction in deaths was never the goal (it cannot be, because there's no vaccine). But if you want an explanation for why Sweden may differ, for whatever reason it appears the virus hits non-whites much harder. This is being observed in the USA and Sweden reports that non-whites from e.g. Iraq, Somalia etc are disproportionately affected. Why that would be so is unclear, but a higher death rate than Norway is likely to be at least partly due to the much higher rate of immigration Sweden has allowed than its neighbours.