70mm movie on a former IMAX theater
In Los Angeles there used to be a true imax theater (AKA The Bridge) at the Howard Hughes center. A couple of years ago, the theater was bought by cinemark and it's now a Cinemark XD. My understanding is they kept the screen (82 ft wide), not sure if they were allowed to keep the projector, but it seems they have a Century 35/70 with SRD, DTS, DTS70, and mag. 70mm.
So now I see this Cinemark XD will be showing Dunkirk in 70mm. If it's 70mm with an imax screen, what would be the difference from watching on a real imax 70mm showing?