Well, hypnosis depends on the subject being either compliant or vulnerable. All synths come with a recall code. No humans come with a recall code. Recall codes operate wirelessly or verbally. Hypnosis is far more complex than simply transmitting a particular string of characters or hearing their equivalent spoken sounds.
Also, hypnosis cannot make you stop breathing or stop your heart from beating or otherwise "turn you off."
So despite the rough similarities, I don't think they are the same, and yes I do consider the existence of recall codes in synths are one of the design features that clues us in that these are not humans and shouldn't be given human rights. Perhaps they should be given "synth rights" and perhaps the set of synth rights might in some ways resemble human rights, but synths should never be capable of harming humans, EVER. They should never be capable of deceiving humans or impersonating them. They should be incapable of lying, and incapable of believing they are humans. Anything short of that, and I'm afraid that, as GECC101 has noted above, synths with liberty are the beginning of the death toll for humans in the Fallout universe.
It is a simple matter of pragmatics. If you give something all of your capabilities plus superhuman levels of them, as well as the liberty to do what it wants, it shouldn't be surprising if it comes back with its buddies and starts bossing you around before too long.