I think that's a really interesting and important question. It is very difficult to make comparisons between countries. Also, most of the excess deaths, which are linked to ethnic group, are not linked to biology. They are linked to people's social situations, and people's social situations are linked to policy choices. Yes, we could say, “Oh no, we can only compare ourselves with populations that have similar ethnic groups”, but to a certain extent, that makes it sound as if race is the determinant. But race isn't the determinant; social policy and racism are the determinant.
Of course if we look at somewhere like Germany, it has a significant migrant population and significant ethnic diversity, including a very large Turkish population, but it has still managed to have a better response than we have.