Sooyoung&Yoona : link (imo,sooyoung and yoona look alike in this pic)

Seohyun&Yuri : link (really look alike)

Taeyeon&Sunny : link (sometimes?)

Yuri&Yoona :
link

Sooyoung and Yoona?noooo for me xD

oh and, i found Taeyeon more alike to Jessica
here: link

yuri and seo ilove them and they like twins and jessica and tae are look like each other too u can add that choice

well, if i ignore the faces....
i'll choose this one because their hair is the same

My first snsd song was Gee. I was like "they aren't exactly twins but they're sisters for sure"

At first I was confused between Yuri and Seohyun... Sometimes I cal Seohyun Yuri and Yuri Seohyun xD

me too , all my friends always thought that Yuri is Seohyun, Seo is Yuri xD

yuri and Yoona

When i first saw GG they were the only people i could not differentiate for about 2 day's Lol

What the hell? XD Taeyeon and Sunny? No not really...
Taeyeon and Jessica yes ^^

I used to confuse between these 2.

None.