No, there are a lot of significant differences. For example, in Empire, when Luke gets thrown into the pit to be killed and eaten by a giant, ravenous beast, while a hostile crowd cheers for the beast, the creature had two arms and was smooth-skinned. In contrast, when John Carter gets thrown into the arena to be killed and eaten by a giant, ravenous beast, while a hostile crowd cheers for the beast, the creature is furry and has four arms.