I think birds have an advantage having bird friends. Even if they end up not getting along, they do still have community. I also think birds can get to know each other and become friends. As with human relationships not all people make fast friends. Sometimes you meet someone slowly and over the years you develop a strong friendship. So with patience I am sure good things can develop between them, especially if they will have some of their own space and aren't expected to share a "bed room".
I can tell this has been eating away at you
@Mantis64 ! You are always worried that your IRN isn't getting 100% of what they need. I appreciate that you consider your bird's lifestyle so much. I think if you bring that same kind of love and dedication to your second bird you will find a very happy birdie household. Though a little noisier
Getting the first bird is a life changing event: new pots, no candles, door and window vigilance, bird friendly everything, prepping fresh foods daily, cleaning, etc.. Getting the second bird is easier. You have already made those changes your house is ready, your habits have become bird dominated. The second bird will add twice the expense at the vet, twice the expense on toys... other than those expenses and the extra time to spend with your new bird, I think you are ready!