How does the 9.5x56 differ from the 9.5x57 case? Sounds the same.

I wonder if this is the same rifle I looked at and considered buying about twelve years ago?

That rifle also had the same peep sight and was also a 9.5mm. Reported at the time as a 9.5x57.

The seller at the time had a 6.5x54 also and was from Tasmania.