It was only confirmed that the red button was missing. I have photos and screencaps from Hoth and Bespin that show the silver fasteners looking dark or black- the lighting has a lot to do with what color they appear.
The going theory is that the saber seen during Dagobah is the same Hero used in the film, and what we know as the SRS is the Hero rebuilt. If memory serves the Dagobah scenes were filmed last for Mark as the Yoda puppet took so long and the saber was rebuilt as it was in pretty bad shape.
But it was not a 'different' saber. There was only one Hero saber.
The going theory is that the saber seen during Dagobah is the same Hero used in the film, and what we know as the SRS is the Hero rebuilt. If memory serves the Dagobah scenes were filmed last for Mark as the Yoda puppet took so long and the saber was rebuilt as it was in pretty bad shape.
But it was not a 'different' saber. There was only one Hero saber.