humm, yes the name of the game may be the same, but they are definitely not the same game. If you want to play exclusively on line then, on line training will suffice. But if you are only playing on-line, don't expect to walk in and sit down at a live game and have the same results that you have in the virtual world.
In a live game you have to actually sit in the presence of these people, and you don't have the option to turn off the chat. Sure you can stick on some headphones and sunglasses but you are still going to smell them and see them jumping around. It is a lot easier to be a rock in the virtual world than it is in the real world. You have to be able to count chips, not just read the number that is posted for each player and the pot. You have to handle the cards and the chips. You blinds don't auto post in a live game And there is no beep to tell you it's your turn.
When I play on line the adrenaline barely gets moving unless I win a monster pot or get a reallllly bad beat, but taking down a monster pot live jumps out the adrenaline like crazy.
So it depends on what you want. If you want to play games around a poker table and not just on your computer? Get the basics down and practice your heart out on-line but you gotta get some real table time if you want to win in that arena.
It takes more guts to play live!