And aside from their regal statuses, Crown Princess Maxima and Queen Sofia have found further common ground together, thanks to their desire to help those in need.
The two ladies were united by their humanitarian efforts this week, as they flew from their respective counties to attend an official meeting in Nairobi.
Prince Willem-Alexander's wife and Sofia - who has been married to Spanish king, Juan Carlos, since May 1962 - were quite evidently delighted to see other, warmly embracing as they came face to face in the Kenyan capital.
Both were attending the Africa-Middle East Regional Microcredit Summit, an event aimed to help end global poverty.
After addressing the gathering on Wednesday with mum-of-three Maxima by her side, Sofia was seen spending the following day with the people of Mathare Valley - reputed to be one of the most deteriorated shantytown villages in Africa.
While there, the 71-year-old royal threw herself into interacting with the locals, from helping to prepare a traditional meal and visiting the homes of residents, to admiring many pieces of handmade beaded jewellery.