HMS Networks USB-Can V2 Interface

What is the difference with part numbers 1.01.0281.11001 and 1.01.0281.12001?

https://www.digikey.com/short/z29p98

https://media.digikey.com/pdf/Data%20Sheets/HMS%20Ind%20Network%20PDFs/USB-to-CAN_V2.pdf

The 1.01.0281.12001 is the part number that has galvanic isolation. The other does not have this option.