That is a silly question isn’t it? Trans identifying teen boys ( rarer than trans identifying teen girls, who are also rare) are not predators.
The trans women in the single sex spaces will be vanishingly few and far between - personally I have never (knowingly) encountered one in any toilet, changing room, sports group, women’s group I have ever been in in all my long years of life. Maybe I just live in the wrong part of the country or don’t get out enough. They will presumably be getting on with whatever it is they are there to do- changing, peeing, knitting, running, chatting, whatever.
The men who might rape women, assault them or abuse them will be literally everywhere else and they will look, sound and act like men. They might be a boyfriend, friend, family member, workmate, at their hobby, in the bar, down their street, wherever. Again, in all my long years, I’ve had some negative and very negative experiences with men in all those places.
Personally, I find most men quite frightening. However, I am not frightened by trans women. I don’t see the two as the same at all.