Linhhhh, welcome to the Board!
As starnightsky pointed, you can find answers and plenty of information for your first question in the Future of The Spanish Monarchy
As for your second question, please specify what exactly you mean by 'differ': traditions? constitutional role? powers and prerogatives? private lives? relationships with Media? other?
Once you've made up your mind, you can ask your question in the General Questions about the Royal Family of Spain
, when asking your questions, please do remember that your research must be done by yourself. Our members can answer some of your questions, but they are certainly not obliged to.
For that very reason, this thread is closed.