(Pete) I think that the Imperial is a scaled-down version of the Olymp: no microtuner neck on most and no roller key for Bb bis. It's definitely possible that there are changes to the bore/bow/bell, but I'd need someone to take measurements.
If you want to change how many album pictures per page, use CTRL+ and CTRL- (Command + and Command - if you have a Mac). 80% looks great on my 4K monitor.