User blog comment:KidLego09/Could B and Beardo Be Brothers?/@comment-24152851-20140915033818/@comment-24152851-20140916003948

Of course they're not going to be exactly the same, otherwise they'd be another Katie and Sadie. This usually refers to their stereotype, and sometimes significant aspects of their personality.

Alejandro is generally considered a smarter Justin, same for Dakota and Lindsay. I agree the Noah-Dave one is a little iffy, the only reason that one is there because everyone seemed to think he was a Noah-clone before TDPI aired.