No, not quite sun conures are a little larger than green cheek conures.
Between ten to twelve inches
There is a huge difference in size. Sun conures and Green Cheek Conures are both small parrots, only slightly bigger than parakeets. An Amazon is a medium sized bird and will most likely kill the smaller Conures.
Yes the green cinnamon can breed with the green cheeked conures.
No they are a very beautiful almost iridescent bird being a beautiful green on the back. Undersides can change from different subspecies. Also hence the name they have green patches on their cheeks. This is coming from a green cheek conure owner.
$400, $500, deapends on pet shops/breeders, age, and, of course, quality.
They can be taught to talk, yes.
Could be a Green-Cheek Conure.
They are sweet and very friendly, but remember it's how we interact with our bird companions that make them good or bad birds. My yellow sided is highly animated and has a huge repetoire. He loves to get everything moving in his cage, and loves time out of the cage for head rubs and running around. Excellent pet; note that all conures can be nippy at times. Mine nips when we play with certain toys and also to tell me he needs to go to the bathroom.
green
As far as i know a green cheek conure can eat pretty much anything (in moderation) but not avocado, chocolate, alcohol or caffeine. and it will need high quality pellets, fresh fruits and veggies, and clean water daily.
Obviously it means that they stand up for gay rights. As for the fact that it was green and on their right cheek, all it means is that they used green paint to paint it on their right cheek.