twins-from-another-mother

A female/male, female/female or male/male dual entity who are identical in their innate characteristics, idiosyncratic behaviors, aesthetics who get along without effort because of an immediate and mutual understanding of the other so much so that they must be identical twins whose conception is unknown.

Chelsea told Derek how much she admired his graphic design aesthetic and he said "I just try to copy what you do" and Chelsea replied "Really? Because I always try to liken my design to yours...we are definitely twins-from-another-mother!" Derek nodded his head in agreement and said "we certainly are..."