I think mostly temperament...... although if you are asking about description, different color egg, different color bird, different feather shape etc.......
NOTE TO FRIEND: be careful how many parrots you wish for!!! Many years ago, I wanted alot too, and then a friend of mine passed away and I inherited ALL of her lifetime supply of various types of breeding parrots. (over 200). Please remember that all parrots are very social creatures and require tons of room and interaction. Also, they are very messy = lots of work and feed. I hope you live in a climate that will allow you to have a huge outdoor enclosure for them. Good luck with your dreams.