It could go well, or it could go not so well.

I think it all depends on whether or not each party educates themselves on the other person's disorder and makes allowances for it.

Also, it will depend on whether or not each feeds into the others disorder.

For example, I have PTSD and in general try to not have friends who have anxiety disorders as we just tend to make each other worse. I have tried many times, and it never ends up well. The anxiety just feeds off the anxiety. On the other hand, I had a friend who has Aspergers and we knew each other for a number of years. He was able to handle my emotional episodes better than most NT people and I was able to get close to him without being triggered (unlike everyone else I've met).