Hot Toys makes the dirty figures, Tomm Wong and OMG take the dirty pictures while we like to watch.
No, but I believe guys like Wong and OMG are given access to the figures ahead of everyone else because their photos actually help sell HT product. Difference being is that Wong is operating out of Milk Magazine and as far as I know OMG is an independent.
Hot Toys and Sideshow gets released in Asia before anywhere else since it's manufactured there, so people there can get the figures like a month before the rest of the world.