One question: Is the JPEG from a RAW+JPEG combo, or the embedded JPEG within a DNG, or did you happen to change camera modes in between? (Sorry if the former two are the case, I’m kind of in a time crunch at the moment…)
I’m not sure if any mobile cameras which do burst stacking + tonemapping will save a DNG that is the result of the burst stack but prior to demosaicing/tonemapping. I don’t know if the Lumia does burst stacking at all, I know Google does it, and I’m assuming Apple is also doing it “under the hood” in some manner.
This is unfortunately one of the limitations of DNGs out of phones - I don’t know if any phone allows you to save a burst of DNGs or to save an intermediary “stacked but not further processed” DNG (sort-of like HDRMerge but instead of merging a bracket, merging a stack to reduce noise). As a result, often all of the processing in the world won’t be able to match what the phone can output as a JPEG because a single DNG doesn’t actually contain all of the information that might go into a JPEG.