Why(?), would be the first question?
If you are considering mating them, that would only cause tension and likely cause unwanted problems.
There are different views on whether Parrots should be keep together in single cage, or kept separately, each in their own cage.
There is no way to assure that any two, three or more Parrots will live well with each other in a confined area. When a single Parrot is having a health issue, it becomes more difficult to identify and treat. In addition, there is the issue regarding diet and whether one is over eating and another is not getting enough, etc...
If you have the space, totally separate cages is my recommendation. If space is a problem, a larger single cage with separate areas can be used.
I am certain that another member will be along supporting multiple Parrots in a single cage.