Other mistake: When Arnold Schwarzenegger is falling into the river next to the dam it is so obvious that the stunt man is being lowered at high speed on a cable. Not only does he not gain speed whilst falling, he falls at a constant speed and can be seen almost swaying in the wind. (00:30:50)
Other mistake: When Adam lands his chopper on the rooftop, he shows his charter contract as proof he is supposed to be there. There is no information filled out for the dates on the contract.
Answer: No. This is exactly the same movie. Underneath Arnold's eyelid is a small dot. The dot represents how many times his character was cloned.