Hi,
it is same film reboxed, but they are constantly improving films, so every new production is little better in stability, contrast, sharpness... This 8x10 is last and best version of the same film.
From impossible:
Late last year, we introduced an all-new B&W integral instant film based on a new formula developed by Impossible's R&D team based in Monheim, Germany. No longer reliant on out-sourced materials, it represented a clear advance on all previous Impossible B&W films, with much-improved tonal range, contrast, sharpness and stability.
Now, after several months of testing and refinement, we are now proud to introduce the all-new large-format version of the film to our European customers.
Impossible B&W 8 x 10 replaces our previous PQ 8 x 10 film and it is easily identified by its simple but elegant, light-proof, black box with clear black and silver labelling. But there is a lot more to this film than new packaging.