The biggest difference is on the topping. Kings Cake (Bolo Rei) is layered on top with dried fruit and nuts, while Queens Cake (Bolo Rainha) omits the fruit (and sometimes the nuts too!).  While Kings Cake is the more popular recipe on the table during the holiday season, the lesser known Queens Cake is starting to rise in popularity due to the fact a lot of people don't like the fruit on top of the cake.