If you are here, then you probably are looking for twinning content otherwise known as clone by conversion on tvtropes.com.
If you want to know more about the concept of twinning, then follow this link here
Anyways here we go I will also put some of the things found on:
Deviantart or https://tvtropes.org/pmwiki/pmwiki.php/Main/CloneByConversion
One last plug for myself, I have a lot of deviantart twinning in my favorites. I also don't want to claim that I have every twinning content, but I do have a ton. I'm more or less a bit subjective, and I choose to put only content I like in them. I wanted to make sub folders to categorize them better, but I don't have core and probably won't buy it. Sorry.
It's more a less a one shot chapter, with only physical changes.
A famous horror manga with essences