UK\US design culture

I have a friend who’s applying for med schools in both the UK and the US right now, and she received the advice (from an admissions officer) that for US applications, you have to be much more self-assured, almost cocky, but for UK applications you have to be much more humble in your statements and let your resume speak for itself.
For those that have worked in both regions, do you think this applies to applications to design firms as well (maybe to a lesser degree)?