The women in the 2nd video don't have their faces covered, which means they still can be seen as individuals and their identities and personhood are not obscured. Also nuns choose to wear their habits as it's their work uniform. They don't have that clothing forced onto them by an oppressive society. Also they are expressing themselves in an artistic way through music, while the Muslims in the first video were being told to shut up and obey. So no, it's not the "same concept" at all.