Sorry I cant help, they all look like shetlands to me!!!
but I am having the same problem and I had a shetland and a charollais cross hampshire down!!
I have small shetland looking lambs, giant shetland looking lambs, shetland lambs with big heads and big ears and tiny lambs that are wide and stocky... I have only have two that are obvs the bigger ram, the rest I have no idea!!!
I think its a waiting game to see how they grow, but it might just be that I have 19 shet lambs and 2 bigger lambs....