This might be the most normal chapter of the series lol.
But it is interesting the "twins" have a different smell. Being the same person, living in the same house, using the same shampoo/conditioner/soap/etc and always being around each other they probably should smell basically completely identical.
But it is kind of nice that she can tell them apart, well...not nice for Yuzu..., but does show her love is not surface deep.