I noted a “team” of nurses today at RPRH who are quite distinctive. One is Mauritian and the other born here in Perth. Other than being RPRH nurses, both femmes, similar sizes and both with a good command of English, they have very few physical commonalities. Their skins are (wonderfully) different. The Perthite is blonde-ish-haired and blue-ish-eyed (basically light Caucasian), the Mauritian is dark-haired and large-brown-eyed (basically fine-boned African), and so on.
When they wander about doing nurselike routines, these two walk in stride, they wear a fundamentally similar expression, they react to the same sights and sounds in (to state it lightly) similar ways, they each start conversations based around the same points of interest, and so on.
An impressive basic observation is that despite the obvious commonalities of behaviour, dedication to good work, politeness, echo reactions and so on, they are each quite different people at heart, both working excellently and not as “mere” mutual clones.