Great minds think alike, I was just going to post my finding with Wireshark.
I discovered that using the Python’s socket library when opening the connection Phyton send a Name Query with port 137 (netbios-ns) while the Zebra Utility doesn’t.
I switch the script to use Java’s socket seems to work the same as the Zebra Utility.
Once I go back to the customer site on Thursday I will verify with an actual printer.
