I believe the first one was a poor attempt at the IM2 arc but coincidentally ended up looking like the one in IM3. I recall people complaining about the major inaccuracies of the Museum Replicas when it first came out, prior to IM3. The second one is the Toy Legends arc replica based on the IM2 and Avengers version. The third and last is the Lager Toys arc which is actually based on the IM3 design, since the product has Mk42 in the title. The one shown in the film didn't have that level of detail but I believe this replica is based on the more detailed rendering in the Art of IM3 book, IIRC.