You may have solved this already but to me the first capture looks similar to this 
It is from here: Using a Subsurface Profile in your Unreal Engine Materials | Unreal Engine 5.4 Documentation | Epic Developer Community
So check the Mean Free Path Distance in the SS profile, it may solve this. Good luck!
I have other problem with SSS:
I just started using SS profile and first it didn’t seem to work at all but then I realized it needs A LOT more light intensity than plain Subsurface.
I get nice results with it but noise is a bit problem, do you (or anyone) know how to reduce noise without quality loss? (Lumen).
I have tried many settings but nothing seems to fix that. I’m using Ultra Dynamic Sky for lighting but it is the separate Point Light inside a hollow SSS material object causes noise. Still as UDS handles the whole lighting it may be some UDS setting. I will ask in UDS Discord but any ideas are welcome
