Yes, but any recent film (in the US at least) should be following DCI resolutions if they want to work on a digital projector. The native resolution for 2K DCI

Yes, but any recent film (in the US at least) should be following DCI resolutions if they want to work on a digital projector. The native resolution for 2K DCI is 2048x1080. If there's a different aspect ratio for a 2K film, then either the horizontal resolution will be 2048 or the vertical resolution with be 1080. Thus, 1.85:1 is 1998x1080, and 2.39:1 is 2048x858. Obviously, you can do something else if you want, but then it's not 2K DCI. It may be outside the digital projector's native display resolution. It would be like pushing a 1440p movie to a 1080p monitor. It's going to look weird even if it has the correct aspect ratio because of mandatory down scaling the monitor has to do. You can't really have a 2K film whose resolution is larger than 2048x1080 if you're following the DCI spec, and AFAIK the DCI spec is the only spec that actually uses the name "2K" as the official name for the resolution. That's the only point I'm making.