I know the one in the movie Gone In 60 Seconds “Eleanor” is NOT a normal 1967 Shebly GT500 Mustang Fastback. Is there an aftermarket body kit on it?

How can you tell the difference between a 1997 Ford Mustang GT, and a 1997 Ford Mustang Cobra.

I think the cobra is completely different from the mustang, but my son thinks the cobra is a type of mustang. Please discuss. Since the mustang is over 40 years old, this could be quite a discussion. Any car experts out there?