I just tested by having one of the default sims have 7 science babies. For science, I set them all to the same gender (6 were female by birth, 1 altered in CAS) so there were no frame differences to get the truest comparison. All 7 children were clones, aside from some differences in their body weight. Parent is in green.
https://i.postimg.cc/903crCQH/science-babies.png
https://i.postimg.cc/zDwsnndg/group.png
Also tested creating 7 through play with genetics in CAS. They all had VERY similar facial features but some had different eye colours, skin details, etc.