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You can't apply anything over a popcorn ceiling finish. You have to remove the pop corn then apply your texture to match.
As long as the surface is flat not glossy it can work.
I don't know what you mean. You're asking a question in abstract with no particulars. How well it blends depends on your skill level.
All these textured finishes are essentially random patterns. So if you're trying to match the texture where 2 rooms now come together making them blend together is a matter of skill and probably not a DIY project.