That's not a helpful distinction, since "reimagining" doesn't automatically mean "new continuity." Case in point, the Star Trek: Discovery TV show heavily reimagines, retcons, and, in a few places, outright contradicts the franchise's twenty-third century era as established in the rest of the franchise (e.g. the modernized ship designs, anachronistic technologies and icons, new alien makup, etc). However, DSC is still canon to the Star Trek universe in spite of how badly it does or doesn't fit with the rest of the franchise.
Besides, if the Powers That Be have stated that all the Mad Max movies take place in the same timeline and all discrepancies are creative license in the "retellings," that's kinda the end of the discussion on whether they take place in different worlds or not.