Margaret the Maid is instead Magnus

So, what happens if Margaret the Maid is born male.
Would this *Magnus, the heir of Norway, be declared King or would there be an earliear abitration by Edward I?
How does this impact events leading to the Union of Kalmar?
etc etc
 
Do we assume that everything else up until her OTL death remains unchanged?

Within reason - I'm pretty sure there'd be some decisions made based on her being the male heir etc.
But if we assume everything goes roughly the same upt to Alexanders death, what happens next?
 
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