I made some searches, seems the wrong part is the silver ring under the red button, would be black on hero prop version.
I took a look a screenshots and it's real, the close up hero version has black ring.
However the stunt versions had silver ring, means there was probably a hero version with silver ring.
Is there a covertec?
I have seen the covertec was optionnal on larbel sabers, and some had wrong covertec position.