Both incidents took place during the night of October 21–22. A Reader informed us about the first car fire, which occurred in ParzyceReader:

(...) before 5 a.m., a car caught fire in Parzyce.

The second car fire was reported by The Bad Buzlaurer:

5:30 a.m. in Bolesławiec, Polna/Chrobrego toward the crossing.
TBB about the incident

Both fires were extinguished and, fortunately, no one was injured.