They are the same, same medical team and staff

in UMMC, you dont choose who operates, also dont choose when you operate, it can be 1 year , 2 years or maybe even never. Operations are very cheap, but its a government hospital thing la.

in UMSC, you choose who operates, but also can choose when you operate, which normally is 2 weeks or sometimes asap.

Prices are higher in UMSC cause its the private arm of UMMC, i dont know about it la, but last time when i approached HUKM, it was about half the going rate of outside private hospitals