There are 2 versions of PS5 controller on the market now, BDM 010 and BDM 020, here are some pics to help you identify them. (Photo took by D33N3R, great thanks)
1. Checking what model MODEL is in a DualSense. An 'A' is added after the controller model number for the BDM-020 models
2. Check the SIDE A of the controller main board, the BDM version was printed on it.