Maria Josepha (OTL Queen of Poland and Electress of Saxony) is born only in 1699 and she is the eldest of the four...
But the good thing about Austria is who we often can choise between so many archduchess...
So for Infante Ferdinand the most logical brides are not the daughters of either Joseph I or Karl VI but their younger sisters:
the most interesting agewise talking is the youngest surviving Maria Magdalena (born in 1689) or her older sister Maria Josepha (born in 1687)
Oh I agree.
Would Carlos, Prince of Asturias be betrothed or married off to say Maria Josepha?