Wow those are subtle LOL! Okay, then, so I'm not an idiot.
Yeah, give me a sighthound any day and I can help you ID it, but these working aussie/bc's are so difficult to differentiate.
One of our therapy dog folks has an aussie w/ tail and I swear I would not be able to tell the difference between that dog and a working merle BC. I'd have to sit down and really stare at it!