They both also have pretty much the same dialogue when you are switching between them in the agent screen with JP voices. One of Anbys is a little longer and ends in the same way, but the second one they both say the exact same thing. Probably more to imply they were both trained together but can also imply their relation to each other.
I had been playing star rail since launch but no yanqing yet to complete my collection. It's not like i keep winning 50/50 either. I hope ZZZ let me collect all characters from standards or at least if i lose 50/50 get me an unique characters..🙏