I've been wondering the same thing. The BB bumpers will fit a handheld launcher, so the Dokken launcher birds should fit a BB. You could drop an email to the helpful folks at Gundog Supply - they should know.
I am not real sure. I would guess so. The Dokkens I used are smaller and they are also harder to see. It was something that my older dog did fine with but I would be careful with a young dog, especially if he is just starting to get marks.
I use all three color loads depending on what I am doing. I did a test with the same loads with my double to test them. I usually use the green loads.