Among the models that received the December 2019 security patch before 3rd of January of 2020, the official Nokia Mobile update tracker also includes the Nokia 3.1 and Nokia 2.3, as was tipped by our readers as well.
The security update for Nokia 3.1 is 115.2MB in size and delivers only the Google security patch for Android for the month of December 2019. The update for the new Nokia 2.3 is around 72MB in size and brings the same changes as the update for Nokia 3.1, so just the security patch.
Thanks Esko and NokiaMob lover for the tips. 🙂