All the Rai tribe of Nepal are more or less the same in appearance. Similarly Limbu are also similar. Newars are vast different in appearance than Brahmin. But there is the explanation about Newars . As the lichhavi of India mixed with the locals of Kathmandu, then mall mixed and socialized in the same group, it is common to have difference in appearance among Newars. Moreover Newar is not a single community. There are alot of community among Newar also. Some are Hindu and some are Buddhist. But brahmin of nepal is considered the same group. Why so much difference?