I've had a soulmate connection with several other INFPs (females). It's no wonder, as we just work similarly inside. I've had such a connection with one INFJ as well, but it was only short-lived; our big differences showed up after a few months.

However, what I value as much, and sometimes ever more, is a mindmate connection. I've had that with one ENTP and one INTP (also females). These friendships were the best fun for me - there was always so much to discuss

I definitely do count a "soulmate connection" with friends. I don't necessarily have to experience it romantically. I believe that a simple infatuation is often confused with such connection, even.