There does not appear to be a Panasonic EXIF field that uniquely identifies the burst or bracket sequence itself. SequenceNumber only tells you the frame’s position within a sequence, not which sequence it belongs to.

A practical workaround is to group images by capture time. If the camera shoots at a fairly consistent frame rate, photos from the same burst will have very close timestamps, and combining that with SequenceNumber can help reconstruct likely groups. For example, comparing DateTimeOriginal values while accounting for the frame’s ordinal can be a useful heuristic.

If original filenames are still available, they can also help as a secondary clue, since numbering often preserves shooting order.

So the short answer is: not reliably from EXIF alone, based on the information provided. You’ll likely need to infer sequence membership from timestamps, file order, and/or filenames.