"Je te souhaite la même chose"
This directly translates to "I wish you the same thing." It is a common and natural way to respond to a well wish in French.
Here's why other translations might not be as good:
* "Je te souhaite pareil": While technically correct, it's a bit more informal and less common.
* "Je te souhaite la même": This is grammatically correct but doesn't always flow well in conversation.
So, "Je te souhaite la même chose" is the most natural and accurate way to say "wish you the same" in French.