There is one big difference! For the bar girls, it can make their livelihood much easier and more lucrative if they can converse with their prospective clients in English. In addition, they spend much more time with foreigners than an average university student ever would as foreigners seek them out for sexual pleasure and most university students seek out foreigners to help them improve their English. This being the case, at least three quarters of their working time is also free oral (speaking) English lesson time.