Your ducklings are beautiful! I remember when we got our ducklings last year. They are just so cute! I am not very well versed in duckling identification. I have 4 Indian Runners myself (3 blue and 1 chocolate). I'd say you are spot on with the first two - Indian Runner and Khaki. The one you thought was a blue swedish might be a blue runner. Ours looked similar to that when they were little. Sorry I can't be of more help. Good luck with your new babies and cherish them while they are small. They grow so quickly! By the way, we love our runners to pieces. They have great personalities and are just hilarious.