It would behoove these studios, especially when upgrading an existing 1080P BD release, to run the old and new discs side-by-side synced up in order to catch any possible editorial mistakes. consider the costs of such a minor error slipping through the cracks.
Does the BD included with the 4K disc appear to be the same as the previously released one?
Edit: I found my answer...Yes. When I went to put the new BD in my Oppo it asked whether I wanted to continue where I last left off on the original disc. Only the disc artwork is slightly different.
Did Criterion stack the 4K and BD discs on top of each other?! I can't tell from that pic above what is going on there with the packaging.
Edit: you put your 4K disc in a DVD keepcase or something, didn't you?