What does the (31) suffix mean on my Hirose Electric Co. LTD. part?

Interconnect Circular Connectors
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What does the (31) suffix mean on some Hirose Electric Co. LTD parts such as LF07WBP-3S(31).
According to the Product Change Notification, many Hirose parts had their suffix changed to (31) when they switched to RoHS compliant materials. The notice contains the parts affected and the Hirose recommended replacement. This snippet shows our example part number.

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For a complete list of the parts affected please see the Product Change Notification

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The suffix is internal for the manufacturer to indicate the packaging and ROHS status.