LoRa E32 HEAD code not corresponding

Hi everyone, my project suddenly broke apart. I've been trying to connect via LoRa E32 (433T30D modules) two arduinos and I had managed to do so; but yesterday, without changing anything in my sketches it stopped working. I immediately tried to reset the modules with the example code but nothing has changed by then. Both channel, ADDH and ADDL are the same (I've left the configuration code unchanged): the only difference between the two printed configuration is the HEAD number. Does this difference matters to the communication between the two? if yes, how can I fix this? Thanks a lot for your help.