They can be identified by Swedish using Ä/Ö and Norwegian using Æ/Ø, but the latter are also used by Danish, which looks almost identical to Norwegian in writing, but sounds quite different
But Swedish and Norwegian are mutually intelligible and closer to each other than certain dialects of Arabic, so it's understandably easy to confuse them
The thing about progressive metal is that too many bands fall into the trap of just being technical, complex, showing off, while forgetting to write actually memorable songs