Twin flame, soulmate, sister from another mister, or brother from another mother — there are many ways to refer to someone you have a special connection with. You know how it's believed that people with moles, birthmarks, or scars that look similar (even identical) in the same spot may have a special relationship across lifetimes? Well, suppose you and your bosom buddy weren't born with matching birthmarks (very likely). In that case, there is another way to mark your special relationship…