I don´t want to be picky but Princess and Sheikha will not be the same,just like Duke or Princess,These are all royal titles but they shouldn´t be confused: but being an Emirati I believed I could remedy your query about sending cards to Royals in this article within the U.A.E. https://royalmembershipcardbenefi02345.atualblog.com/39141147/5-simple-techniques-for-royal-membership-card-benefits