I've never been to Nepal, but my guess is that there could be both similar and and different ways (from the Indian ways) of making tea, in Nepal. Similar, because India and Nepal have some common cultural background in some areas, and different, maybe because Nepal is near Tibet. E.g. had been reading about those areas recently, and had read that Tibetans make tea with (yak?) butter and salt. Think I read that some Nepalese make it that way too. And I actually tried having tea with (regular cow) butter and salt once, it was not bad :)
they did originally use yak butter, and still do, but increasingly do use butter made from cow milk, since it is more available now. Maybe you saw a case of that.
Update: Just searched again and found a few more interesting links. Also, they (Tibetans) pour the butter tea into their tsampa, also a staple food among them:
