An Admin has created a Configuration Attribute on the Product A bundle, and now needs...

Check “Apply to Product Options” on the existing Configuration Attribute, then make Product B an option of Product A.

Create a second Configuration Attribute on Product B, no further administration required.

Create a second Configured Product record for Product B on the existing Configuration Attribute.

Create a second Product Option field with identical values, then create a second Configuration Attribute on Product B.