Yeah both of them look like they are male the green and yellow looks like he is showing really good ( he might be in breeding condition) where as the blue isn't as bold as his. They might be a bit snappy at each other because they are both boys and they might be sorting out who the top bird is. But how to tell gender is that the boys will have blue or purplish pink Ceres depending on colour and or mutation where as girls will always have brown ( this may go from white, pale or dark and fluctuate in the colour of brown depending on if they are in and out of breeding condition) in younger birds it is pretty hard to tell especially if they haven't shown yet but the males are pretty bold, bright and covering where as the females is paler and while start to develop white circle around the nostrils and it will turn whitish brown and should than turn brown