Soviet Dominated Korea

How would the Soviets completely taking the Korean peninsula change Korea's development? While the assumption is that it would just be a bigger North Korea, without a Korean War, or the presence of American forces nearby, I think that a wholey communist Korea would not be able to become the brutal dictatorship it became. I'm not sure about PoD, but I don't think it's as relevent here, just the Soviets invade a bit earlier, or the Nuclear bomb gets dropped a bit later and Japan surrenders a bit later.
 
Communist states that arise from a divided whole (i.e. DPRK, DDR, PRVN, etc.) tend to be much more brutal than otherwise comparable Communist states with the exception of North Vietnam, which was because the south was so screwed up they didn’t have to use really brutal oppression less anything looser result in mass flight to the capitalist part.

If North Korea was whole it would be much more stable. I can see the oppression being about on level with China or Vietnam, with economic metrics being far better than the DPRK but far worse than the ROK.
 
What about the Sino-Soviet split? How would that be affected.
Communist Korea would back the Soviets due to the aid they received, but would turn to China following the Soviet collapse. I do see China being tougher on Korea without needing it as a buffer to American forces (cracking down on Korea's nuclear program, criminal activities, etc) to prevent destabilization of the region. Also, without the fear of capitalist forces this Korea may not be isolated or combative vs the rest of the world. Ironically, they may turn to the US to combat Chinese hegemony just like Vietnam did.
 
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