Does human to human interface carry the same information from the brain I'd like to know if the human to human interface carry the same information from the brain or it is just a signal that switch on or off electrical impulses that causes the limb to contract?

Is it even possible to take someone else signal coming from the brain and redirect to somebody else where the other person can use it for the same result or is it always going to be digital type On or OFF and not analog?
The answer for the particular interface that you linked to is that a single scalar variable is being passed.  The EMG activity in one person controls an electrical signal that is connected to a nerve in the second person, which when activated causes the muscle to contract.  The EMG activity is thresholded and then the binary information of whether or not it passes that threshold is passed to a "TENS unit" whose output can be controlled in an analog way.

While the actual information being passed in this demonstration is binary, there is no reason why it must be so.  It is simply a result of the design decisions the creators made.