In a recent interview with Japanese publication Weekly Famitsu, Final Fantasy VII Remake and Kingdom Hearts III director Tetsuya Nomura stated that "parts" of the former game, such as cutscenes, are further in development than those in the later title.
Further, he went on to state that the team – in regards to VII Remake – is currently "in the process of switching from outsourced development to development in-house", meaning that it would be a while until fans hear about any release window information.
In the same interview, the director commented on the appointment as of Naoki Hamaguchi as project lead mentioning that, in actuality, Hamaguchi – who had previously worked on Mobius: Final Fantasy – was involved with the project from the beginning, though he is communicating with the staff more directly now.
Kingdom Hearts III has a release window of 2018 for PlayStation 4 and Xbox One. Final Fantasy VII Remake doesn't have a release window as of late, though we know it is coming to PlayStation 4 (eventually).