I disagree Ammi it's not the same at all and you even outlined my reasons for thinking so. Bear is immature and self-centered. He finds superficial buttons to push for his own amusement yes, but they are basically "generalised" buttons just to irritate anyone / everyone.
Helen you got in one word. Bitter. A genuinely twisted, broken woman. She deliberately preyed on people's INDIVIDUAL hang-ups, not for amusement, not because it made her laugh (beyond a stoney faced cackle), but because she genuinely just liked to see people hurt and isolated. She wasn't immature and self centered. She was straight up cruel, hard and abusive.
Give me an immature child playing daft games causing a bit of destruction, over a deliberately spiteful and vicious adult any day of the week.
Talk to the housemates who have been in there this time, any of them, about Bear in a few years time and they'll almost certainly just laugh about what a nightmare he was to live with.
Ask half (or more) of Helen Wood's housemates what they think of her still.