Seems like some of their digital releases have their own catalog numbers (SQEX-5*****) and I think the numbers are basically included in the URL of mora, as suggested by
today's 4 Gamer.net article. Currently, there are many holes.
SQEX-50000~2
SQEX-50005~11
SQEX-50013~14
SQEX-50019
SQEX-50021
SQEX-50022
SQEX-50025
SQEX-50026
While we're supposed not to add a digital reprint entry unless there is something different or exclusive (a couple of my past submissions didn't meet this condition), I think their digital releases would be exceptions, now that they turn out to have more legitimacy for having its own entry.
EDIT: There seems to be another catalog number (SEMO-*****). Maybe we would have to wait until this stem is actually confirmed to serve as the catalog number?