Mutton from any country in the same region such as Bangladesh, Afghanistan, Nepal, Pakistan will carry the same taste. Frankly speaking, the goats do not understand these man-made borders and produce meat according to the rules of nature and not politics. When you go into and Indian or Pakistani restaurant, how do you check which country the meat came from? As such, asking specifically for "Indian lamb" reflects racism as britexpat has rightly pointed out, and nothing but that.