MN 57, Kukkuravatika Sutta (the dog duty ascetic) relates karma, transmigration and sankhara. In particular paragraph 8 (below). B. Bodhi relates the sankhara both verb and noun to the one from the paticcasamuppada.

Idha, puṇṇa, ekacco sabyābajjhaṃ kāyasaṅkhāraṃ abhisaṅkharoti, sabyābajjhaṃ vacīsaṅkhāraṃ abhisaṅkharoti, sabyābajjhaṃ manosaṅkhāraṃ abhisaṅkharoti. So sabyābajjhaṃ kāyasaṅkhāraṃ abhisaṅkharitvā, sabyābajjhaṃ vacīsaṅkhāraṃ abhisaṅkharitvā, sabyābajjhaṃ manosaṅkhāraṃ abhisaṅkharitvā, sabyābajjhaṃ lokaṃ upapajjati. Tamenaṃ sabyābajjhaṃ lokaṃ upapannaṃ samānaṃ sabyābajjhā phassā phusanti. So sabyābajjhehi phassehi phuṭṭho samāno sabyābajjhaṃ vedanaṃ vedeti ekantadukkhaṃ, seyyathāpi sattā nerayikā. Iti kho, puṇṇa, bhūtā bhūtassa upapatti hoti; yaṃ karoti tena upapajjati, upapannamenaṃ phassā phusanti. Evampāhaṃ, puṇṇa, ‘kammadāyādā sattā’ti vadāmi. Idaṃ vuccati, puṇṇa, kammaṃ kaṇhaṃ kaṇhavipākaṃ

Here, Puṇṇa, someone develops the dog-duty fully and uninterruptedly; he develops the dog-habit fully and uninterruptedly; he develops the dog-mind fully and uninterruptedly; he develops dog-behaviour fully and uninterruptedly. Having done so, on the dissolution of the body, after death, he reappears in the company of dogs. But if he has such a view as this: ‘By this virtue or observance or asceticism or holy life I shall become a great god or some lesser god,’ that is wrong view in his case. Now there are two destinations for one with wrong view, I say: hell or the animal realm. So, Puṇṇa, if his dog-duty succeeds, it will lead him to the company of dogs; if it fails, it will lead him to hell.