Recommend

The only manga I know is So Cute It Hurts, though I never read it lol

http://www.mangago.zone/read-manga/arisa/
(The sibings are boy and girl though : http://www.mangago.zone/read-manga/kobayashi_ga_kawai_sugite_tsurai/)
based on ur examples, not sure if you'd like these haha

it's not common in BL but shoujo there are tons. im sorta lazy checking the straight mangas i've tho lol.
the ones i can recall at the top of my head are
- arisa
- tackle of my life (hwang mr)
- men's life
here are the ones i have read at mangago while logged in. strange, i remember tagging quite a number i wonder why it's not here
http://www.mangago.zone/people/tag/49344/twin+swap/

Not exactly what I was looking for but it will do, Thank you so much. (●'◡'●)ﾉ

Hahaha, I have read these mangas but thanks for the help.
Also, huge fan of your collections!! ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄

Thanks, i'm reading it at this moment.

Welcome, thanks. I'm being voted down by troll(s) currently so just check my reviews on my page instead. And, fortunately i remember one old manwha bec of someone's post in the boards. Here http://www.mangago.zone/read-manga/hot_blooded_woman/

Thanks again for the recommendation. (=・ω・=)