In other words, they're not the same thing, but the denial of the Holocaust has just as much evidence as the denial of the "official" theory of 9/11. Those ignorant of the details may consider either valid, but they are wrong, whether they are espousing Holocaust denial or 9/11 controlled demolition "theory" or Moon Hoax "theory" or whatever.
Originally Posted by Merriam-Webster Online Dictionary
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"