Following my last few posts clearing out my archive of photos of theropod skulls here’s a couple of Tyrannosaurus heads in near ventral view. The upper one is from Oxford and has, I think, a nice background in the glass roof panels, while the lower image is from the IVPP in Beijing.
Dave Hone's Archosaur Musings 
Looking at the photos, are they casts of the exact same specimen?
I don’t think so, but if they are, they’re of different levels of quality – the Chinese one doesn’t have the more minor fenestra actually open.
The Oxford ‘rex is a cast of the specimen known as “Stan”, the original of which is at the Black Hills Institute. The IVPP T.rex is a cast of a Tyrrell Museum specimen known as “Black Beauty” , another cast of which is on display at the California Academy of Sciences.
Well most of the IVPP one is Black Beauty: https://archosaurmusings.wordpress.com/2008/11/25/deep-inside-black-beauty/ don’t know if that includes the skull though.
Love the irony of black beauty being painted red in the cast.
Simply looking at the premaxillary arcade indicates differences between the casts.