WI: Tomasso of Savoy, King of Spain

I was just reading the beginning of Milarqui's The Legacy of the Glorious and came across an interesting tidbit of information. In OTL, when searching for a candidate in the Royal Houses of Europe to become the King of Spain in 1869, one of the potential candidates was Prince Tomasso of Savoy, the Duke of Genoa and the cousin of Amadeo of Savoy, who in OTL would later become King of Spain. Tomasso of Savoy, who was 13 at the time, was accepted by the Spanish Parliament to become the next king, but at the very last moment his mother Maria Theresa rejected the offer, citing the "instability" in Spain at the time. So, what happens if Maria Theresa agreed to let the Duke of Genoa become the king of Spain in 1968?
 
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