There's totally a difference. I know you're not just impulse buying these and wouldn't get them if you didn't think you had a fair shot at keeping them. My main concern was you didn't know what they ate (I didn't know you had gotten them to eat til the last post). That means there's hope for the other one.
I actually have a lot of respect for your interest and efforts in keeping difficult species. As I read the earlier posts I was just a little like "WTF is he doing if he doesn't even know what they eat?!". Hopefully the remaining shrimp keeps on keeping on for you.