Not exactly, just due to the number of things that are different. Dungeon elites hit much softer on Classic than on private servers, boss parry is much higher (almost 3x) on Classic compared to private servers, and regular mobs have differences as well. People can use the private server knowledge as a base, but it won't be much more reliable than anything else, just due to the huge amount of guess work used on private servers.
These guys will have a better grasp on Classic than most random people, but that doesn't mean anything they know is right (as evidenced in multiple Blue posts).
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