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I am kind of a fan of Charles V despite being a protestant. Charles was born in Ghent but eventually ended his life in Spain. After he died the Hapsburg domains were split into the Spaniards under his son Phillip II and his brother Ferdinand who became the HRE. Ferdinand was born in Spain however.
So what if they swapped?
What if it was Ferdinand who ruled in Spain for Charles and it was Charles's Alt-Son who became the next HRE? This would probably mean Charles himself spends more time in the HRE leaving Ferdinand as his regent or agent or whatever in Spain.
Is it possible? What are the ramifications if the Hapsburg branches swap?