Is it just me?

I swear I thought they were brothers

Yeah. I have seen that in other manga as well, I think is because the authors usually have the same base/model for a seme or an uke. I once read a manga that had multiple main characters and everyone looked the same, both seme and uke. I stopped reading it because I kept getting confused, didn't know who was who.... (￣∇￣")

I thought they’re the same person (≧∇≦)

I would do the same if I encounter something like that lol. I would be so confused and eventually lose my interest. ╮(￣▽￣)╭