I believe that many/most Canadian timber wolves in this country are referred to as Mackenzie River type. I presume that this river is in Canada, but I am not sure what makes it a particular subspecies. Wolves do have a habit of being oversplit into various types, often on political lines (ie. Carpathian, Iberian and Scandinavian populations of Canis lupus lupus).
I agree that HWP should not have culled their hybrid pack on such tenuous reasons, however I do know how difficult it is to relocate unwanted wolves in the UK from personal experience. You might be shocked about how many zoos do cull unwanted stock.