The NES version is completely remade from scratch and contains new NES exclusive content, so it'll be sold as a separate game once the physical release has happened, which hopefully will be soon.
Awesome, suggest you sell these to handheld emulator fans who are using RGM portable handheld emulators like me - the ROM should be sold to them. Let me know if you want to work together on that as I would know to market to them.