Heyman's was a worked shoot too. It was the last promo before one of the big PPVs during the Invasion(may have actually been Invasion, don't remember).
While I don't remember seeing the Cornette promos when they happened, I'm pretty sure those were just worked shoots when they decided to have Cornette bring the NWA into WWE. Never really understood that whole storyline, but I was young at the time and nothing about it intrigued me enough to look into it(I mean, Dan Severn, really?)