Shikashi, bīfu to itte mo sāroin, rōsu, hire nado kasho ni yotte aji ga chigau.
But, while it is all beef, cuts such as sirloin, loin, tenderloin and so on have different flavor.
2022 April 5 (last accessed), “‘Tonkatsu’ to ‘hirekatsu’ ‘rosukatsu’ no chigai wa? [What’s the difference between ‘pork cutlet’ and ‘tenderloin cutlet’ or ‘loin cutlet’?]”, in Ippun de yomeru!! ‘Chigai wa?’[1], archived from the original on June 20, 2017:
「ひれかつ」とは、おもに豚の大腰筋の部位「ヒレ」を用いた「とんかつ」の呼称です。
“Hire katsu” to wa, omoni buta no daiyōkin no bui “hire” o mochīta “tonkatsu” no koshō desu.
“Filet cutlet” primarily refers to “tonkatsu” (pork cutlet) that uses the “tenderloin” of the pig, meat from the psoas major muscle.