When you start making changes with FilmPack, you are starting with whatever DxO Preset you had applied before making any further changes using FilmPack.
Only two settings in the originally applied DxO Preset can be changed using FilmPack. These are "Color Rendering" which you most likely will change from your Camera Rendering to a FilmPack Film "Color Rendering" and "Style-Toning" which you may or may not change in FilmPack.
From there, using FilmPack, going forward there are additional settings selections that cannot be made directly to an applied DxO Preset. You may or may not choose to make these.
So in summary, when you apply changes in FilmPack, you make custom changes to the DxO Preset that you originally applied to your image. In answer to your question then, is that there is no specifically identifiable DxO Preset that is applied when you use FilmPack -- by using FilmPack in DxO Optics Pro you are in effect creating a new Custom Preset. If you wish, you can use "Save Settings as a Preset" to make this a re-usable preset that you can apply to other images if what you have done is something that you would like to apply to other images.
Does this answer you question?