VSCO FILM 03: I noticed that changing the presets also pulls up matching presets in the Tone Curve panel, can I use that menu to change presets instead? Can I use it for anything?

You definitely cannot use that menu to switch between films, only the actual presets in the preset menu will pull up the films properly. We don’t recommend doing so, but it is obviously possible to apply a different film’s curve to a film preset. While it may work, this is not intended behavior and you may have brightness and color problems if you do so.