I doubt that the schools will accept the new score because, as I understand, they will start reviewing all the applications once the deadline has passed. During the process, they probably won't have much time/energy to match your new score to your application.
but in most cases, you need report your G/T scores in the application files. You need ask the admissions officer directly if they accept another scores. In my experience, for Top bschools, they don't ; for others, they do.