yes ,but it a is a question of understanding style.
an opera singer may have a good technique,and not enmploy excess vibrato when singing a folk song,but if the repertoire is unfamilar and he has a .lack of understanding of other aspects of folk style,he will sound like an opera singer trying to sing folk songs.
all styles be they jazz,or whatever, require an absorption,before they can be sung convincingly or stylistically accurately.