That looks pretty sweet!
There are a couple of "Red Dragons" floating around, The Tyree Red Dragon typically goes for a bit more than $50 a frag. I think this is the original Red Dragon. Since then, mariculture has started to bring in a reddish Acropora Carduus which is the same species as Tyree's Red Dragon. Retailers have started to call this Redish Acropora Carduus a "Red Dragon", but is not necessarily the same as the Tyree Red Dragon. I believe Tyree and some other people call this Redish Acropora Carddus a "Pink Dragon Tails" to distinguish it from the Tyree Red Dragon.
I have all three of the above mentioned along with a Purple Dragon and a Blue Dragon (which there are a couple of different variants of as well), and to me the obvious difference between a Tyree Red Dragon and a mariculture Redish Acropora Carduus "Red Dragon"/Pink Dragon Tails is that the Tyree Red Dragon has a bit more blue in it with the white polyps.
Tyree Red Dragon:
Maricultured Acropora Carduus "Red Dragon" / Pink Dragon Tails: (But sold to me from a local retailer as simply a "Red Dragon"
Blue Dragon:
And the Pacman of course looks very similar but has the green tips. I believe they are just different colour morophs of the same or very close relative species. And of course placement of the coral and it's environment will affect its colour as well.
Isn't the name game fun :-)