Not necessarily. Both can be incarnate at the same time but both may not be at the same level of spiritual evolution and often times their paths don't cross, or if they do they are drawn to each other but there are problems.

I have met my twin, we pretty much had all the "symptoms" listed, with the exception that we didn't have a sexual relationship and more often than not I wanted to beat his head in with a claw hammer. He is arrogant, egotistical, self-absorbed, pig-headed, and immature. But regardless of his MANY faults I do still love him and wish the best for him...as long as he stays the hell away from me and doesn't drag me into his drama!