Now that Rise is out on PS and Xbox (so much for not releasing on consoles because "it's designed for handhelds") we will never know the sales splits without a leak similar to World's.
PS and Xbox will add a few million (2-4) but I doubt that would be enough to come very close to World. Still, the game is a massive success provided there isn't too much overlap between its and World's development teams. Having two mostly seperate teams developing such big sellers is huge for Capcom and MH fans. I can see them announce their next MH later this year or early 2024, hopefully a true "next gen" experience.