This is a sublist of

Switch Real Children VS. Fake Children

https://www.novelupdates.info/viewlist/24775/?ft=yes

It deals strictly with real child vs fake child conflict in novels, no quick transmigration

Note: the list is segmented BxG first, then BL, then Yuri

My other lists can be found here https://www.novelupdates.info/user/231781/kawaii12345/
and include

Lost And Found Children

Switch Real Children VS. Fake Children (children coming to terms with being switched)

Fake Children vs Real Children Quick Transmigration
Real Child vs Fake Child Standalone list
Sibling Warfare (when the kids are about to kill each other)
Poisonous Families
Transmigrated into a novel
ACT: Ancient China Transmigration