Why would it be the same? You're offering up the theory, you're doing the legwork.
Because authoritarian governments dont like to be bossed around by people they dont need.
Every time a communist government wasnt under existential threat it turned against the USSR.
It happened in Yugoslavia,Albania and Vietnam.
If Korea is unified then their communist government doesnt have any pressing existential crisis,their dreams are fulfilled,they have nowhere left to expand and the only issue they have now is China and the USSR trying to boss them around.
So in effect there is no siege mentality,no need for a bunker in every toilet,no Juche policy.
Such a Korea has none of the reasons historic NK turned into a hellhole.
Do you people assume NK became a hellhole just because their leaders through it looked fancy?
It had real world reasons for ending up like that,remove the constant siege mentality and pressure and you remove that problem.
In fact it could be argued that even Cuba wouldnt have turned into a USSR bastion if the USA wasnt so obviously trying to squish it.
US efforts to eliminate communist governments was what made them enemies and USSR puppets,not because of the ideological position of the government itself.