i was wondering if it was allowed to send the same personal statement to different universities i’m looking forward to apply to
Yes. You can make your personal statement specific to a school if you want, but that’s not really necessary since many schools require supplements that are more specific to the schools you are applying to.
Yes, you can, but don’t reuse an essay just for the sake of reusing it or being easier if you can answer the question or prompt more effectively with a new piece of writing.