You are free to use any map that can help you accurately place the pin. Due to the split however, you may see discrepancies in IITC for existing wayspots in Scopely’s database. The web submit map will show you the existing wayspots at the moment of submission.
An accepted wayspot is not guaranteed to appear in the preferred game(s). The wayspots are still subject to each game’s inclusion algorithms that determine how they will be used. Why an accepted Wayspot may not be used in Pokemon Go (S2 cells and Pokemon Go)