You mean together? It depends on the specific birds more than on the species. In any case, they're very closely related and can mate so there's certainly nothing barring them from being housed together, assuming they're friendly.
So long as the birds are happy, or if they are more agressive you may need to introduce them slowly together but they will breed together if all goes well.. so group aviary setups dont work if you want alex's to breed only with alex's and vis versa.