Universal, as evident by the back unlock slider below the flash bracket (the Super 23 would instead have two bellow lock knobs above and below the same).
Yes, plus the Super 23 does not have a removable "back", only a removable "film holder", and thus does not accept the Polaroid film holder seen in the picture.
That does not look like a Polaroid holder. ...
...and what do I do? Go look up the camera ...
the fact that it bumps forward and not backward on the far side both indicate that it is not Mamiya style roll holder.