How it compares to the common sibling
The CS1W-CN131-B2: The CS1W-CN133-B2 carries identical specs — same length, same connectors, same approvals. For all practical sourcing and fit purposes they're interchangeable; the differing order code likely reflects a production batch or packaging variant. If you're restocking a BOM that called out CN133-B2, this part drops in without rewiring. The shorter CS1W-CN133 (10 m) and CS1W-CN521 (5 m) are the only real length alternatives in the CS1W I/O cable family.