Julien's K rate is high but some of that is due to his eye at the plate. That's nothing like Hiura.
Julien has a swinging strike percentage of 10%. The best Hiura ever posted, his rookie year, was 17.5%.
Julien had a zone contact of 81.4%. The best Hiura has ever posted is 76.9%, again his rookie year. He has spent multiple years in the 60s.
Julien's overall contact numbers are similarly different, about 12 percentage points higher than Hiura's career mark. Julien also swings far less often than Hiura, over ten percentage points less often.
They're really nothing alike other than they both strike out (and Julien not as often as Hiura even in his rookie season, adjusted for the league average). But strikeouts can be reached in very different ways. Hiura just flat-out misses the ball, Julien chooses not to swing at borderline pitches but makes better contact when he does choose to swing.