I think they look very similar... most of them. I done quite a bit of travelling and studying abroad while at university though and as my friendship group gets larger (and including Asians), I'm finding it more and more easier to distinguish them. But yea I have trouble. Similarly I sometimes have trouble recognising two of my black guy friends. Nothing personal, it gets easier the more experienced I get. My friend (a female) from Thailand also found it difficult telling European/white and black race's apart. She's also got better the more people she meets.
I don't think so but each one of them is actually have the unique look. From my observation, some of them cute, some of them have ordinary simple nice look and some of them do have look like Caucasian but with black or dark brown hair and some of them do have natural light brown eyes. Also some of them have same height like European guys.I know because I am Asian :-)