Don’t know if this is the right place to ask this question but here it goes.
What is your thought about having a player who is playing the same premade adventure in another game? In my case it would be Hoard of the dragon queen + Rise of Tiamat. I am playing on Roll20 and recently joined a Hoard of the dragon queen game, we haven’t yet started, but going to start next week. However, I also wanted to join another game of hoard of the dragon queen with some other players. Reason I want this is because I haven’t played d&d for quite some time, just joined roll20 because of that. I am really itching for more d&d you see 
I am new to roll20 if that matters. Hard to find players in real life.
I just wondering what you would think as a DM, if you had a player who had done it before, or running it with another DM some other day? Is it acceptable? I am not sure what to make out of it myself. All I know is that I want more d&d 
Going though the same adventure twice is fine. There's usually plenty of differences to keep it interesting. Games can easily go plenty of ways.
Just don't use your previous knowlage to meta-game.
i.e. don't take draconic language,
or prepare anti-undead spells when there's an undead ambush,
or specificly search the arms of the throne for a secret switch,
or attack the guy who hands you a letter because you know he will betray you later.
What mellored said plus: have the courtesy to let both your DMs know that you'll be playing through the same adventure with another group. Chances are they'll be cool with it, but it's a good idea to run it past them anyway.
I think I can do all those things just fine. I am more afraid of loosing some precious reputation as a newbie to Roll20, because of what the DMs might think of that. Would you as a DM be ok with that?
edit: Didn`t see what pukunui wrote before this post. I guess I have to ask BOTH DMs, as to what they think if of it.
Mandarin wrote:
You could also look around for a Lost Mines of Phandelver adventure instead.
Be up front with your DMs about this - some people take this sort of thing the wrong way for some reason.
And if you're going to use your knowledge of the game in any way, be sure you're doing it in a way that is fun for everyone and will help lead to the creation of exciting, memorable stories.
It's perfectly acceptable. As a DM I would definitely want to know that you'd played it before.
Back in the day, my group must have played the original Ravenloft a dozen times. Although that module had replayability in mind when it was designed.
Hmmm...
I suggest playing as a divination wizard.... 
mellored wrote:
My suggestion would be to play basically as different type of character as possible in each game also. The reasoning is that even when certain things happen "exactly the same" how you approach dealing with them will be different, kind of helping keep the separation/difference even easier.
I replay events only if the characters I have are very different...it definitely makes for a varied experience.
I.e. Front line Paladin vs a support wizard...
remember different DM will run the same module differently, because they won't read it the same way, they won't interprate it the same way etc... and the player are a BIG part of th story and can change a chapter completly. if you are with a party of diplomat, you speak with the NPC and everything goes fine, you get your next guest and advance. Your with a party of raging barbarian and attack on sght instead of speaking, The NPC fight back and you found in there pocket the SAME quest that you receive when you spoke with them. except when you spoke with them they sent word to the guard ahead to let you pass, with the raging beserker group you'll have to fight the guard.
have if you play a different kind of character (you are teh bard in one and the raging barbarian in the other for example) since you have such a different kind of abilities it will be hard to do the same thing.
Mandarin wrote:
Multiple DMs often belong to the same table-top groups, so it's actually fairly common for a "player" to have at least read a module before playing it. That's why many DMs will tweak the module contents as they run the game. So, just like everyone else has already said, just let the DMs know what you know, so they at least have the opportunity to provide you with something new.
Mandarin wrote:
I'd require the player to be very strict on playing based on what his character can reasonably know and deduce and not base his decisions too much on metagame knowledge. Haven't read either of those adventures so maybe this isn't a big deal.
As a player I could see myself wanting to replay the same adventure with a different group and DM. I'd bet there'd be enough variation to keep in interesting. Hell, even just playing a different character can drastically change things.