I thought you were referring to the 4K SDR master that MGM made back in 2017? (Redeem code, I mean. Apologies)
Honestly, I don't know. I've never watched those 4K SDR versions.
Fandango at Home/Vudu claims that I own "4K Ultra HD," but the app automatically upscales everything to 4K regardless of how it originated, so I can't validate if that's correct. The Fandango copy of Dr. No measures 1.66:1 (like the Blu-ray), whereas the 4K UHD disc is closer to 1.75:1, so I'm pretty confident that they're different masters. During the "Three Blind Mice" section of the opening credits, the UHD is a little tighter on the top of the frame, whereas Fandango is a pretty close match to the Blu-ray framing.
BLU-RAY
FANDANGO
4K UHD