There is so much differn't about that car that its hard to not be able to tell a differnce between a 90 Q45 and a "Beta" model Q45.
Here are some more pictures which you can zoom in.
http://picasaweb.google.com/ppastos/Q45Reviews#
Spoiler alert................................Look at the clock, dash, seat controls, Active suspension knob, mirror controls, center console...