How true are some of these replica sets to the originals in the movie?
They are about as accurate as they can be! I would say that most are about 99.99% authentic! Now, they are not clones of what is on the film, since this is stone-cold reality and that was mostly CGI! There have been quite a few upgrades and liberties taken in some designs, but that’s just all part of the evolution of styles, designs, and changing tastes with each generation. In some cases the coloring of a product might be a little bit different or a little bit off, too. In the case of the last Star Wars installment, many products and paraphernalia had been produced before the release of the film, so accuracy was almost a non-issue