Ive installed CotS r2 first then CotS reworked which override some but its not much.
Followers is also standalone.
Ive also installled npc Cots overall by glouf and it dont come in conflict with other mods.
Ive got high elf childrace
child CotS original
Child Cots reworked
So five choice and seems all working fine.
The CotS reworked is for now little limited with options like brows or choices on nose-mouth-eyes. Hair seems np i got plenty of choice on hair.
Warning: on overhaul npc many grownups will change into child bodys but still have adult voices.
Oh and when you install the fixed high patch that can come in conflict with child followers they are then same hight as adult npc.
Ive np with hight fix so ive partly not installed the patch so in racemenu or first person i still have that problem, but my followers have there original child hight back thats more importend to me.