I don't really have a list of such fanfictions at hand. You could try searching on some popular fanfiction websites like Archive of Our Own or FanFiction.net. Use keywords like 'Harry Potter', 'twin', and 'idiot' to narrow down your search, but be prepared that you might not find a lot of high - quality ones with such a potentially controversial premise.
Sorry, I'm not aware of any specific fanfictions with that exact theme. There are so many Harry Potter fanfictions out there that it's hard to point out ones with this particular idea.
Unfortunately, I can't recommend any similar fanfictions. It's not a very common or well - known theme as far as I know. You might have better luck asking in Harry Potter fan communities or forums where fans might be more likely to know of such unique takes on the story.
Chapter 307, "I Am Sister's Real Younger Brother!", is the clearest early answer because it turns Zhou Wenshu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with From the certificates and trophies on the wall, it was clear that...
Chapter 767, "Jiang, Jiang Yu?!", is the clearest early answer because it turns Jiang Mingyu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Then, Zhao Lang felt a different kind of gaze and turned his head,...
Chapter 619, "The Feast of Fish CP Is Indeed Real!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 317, "You Can't Afford to Mess with the Person Behind Her!", is the clearest early answer because it turns Yu Yiang's situation into a concrete plot event. Early on, He Pingzhang gazed at the man curled up before him, unable to.... By the end, When had he offended such a character?!.
Chapter 275, "Five Defects and Three Shortcomings", is the clearest early answer because it turns Hu Zi's situation into a concrete plot event. The chapter gives readers a real answer by opening on Hu Zi was exceptionally cooperative, and within half an hour, all the...
Chapter 444, "Wait and See", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Carrying a backpack, Yu Li walked for over ten minutes but ultimately...
Chapter 276, "He Will Definitely Make This Woman Pay a Price!", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter turns that into something concrete by moving from After listening to Jiang Li's words, Shen Lan's brow furrowed again.
Chapter 601, "Going Home", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Gu Qiang was in a very pleasant mood. and ending on They finally had a day off, better let him be..
Chapter 222, "Oh, Miss Jiang Has Drawn It", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with How come they're even live streaming in a reality show?!
Chapter 561, "How Can This Young Master Use His Hands to Kill Fish?", is the clearest early answer because the violence around Guo Xing becomes final instead of hypothetical.