yoona has those things under her eyes, not bags but its like puffy? または how sunny 発言しました they're like ご飯, 米 cakes? lol and i think her cheeks may be bigger than yuri's i'm sure if あなた keep watching 動画 of snsd in shows and stuff you'll be able to tell the difference in no time (you can't really see those differences in this picture - yoona is on the right and yuri is on the left - but once あなた figure it out, you'll see they look pretty different)
i honestly don't think they look alike at all. yuri's darker and has slightly smaller but rounder eyes. plus yoona has like a cute cat-like nose but yuri has a straight one. yuri has idk what to call is? a line from her nose to her cupid's bow (mouth) when she talks and smiles?