RC60-71B is a ground riding deck and the BX deck is a floating deck. Even if the attachment points would line up( which they won't), you still wouldn't be able to lift the deck up off the ground due to chassis clearance.
Kubota L3710, Ford 5600, Case MB4/94, Kubota B6200
If you really want the answer to that, talk to a Kubota parts person and see if the parts book lists a mount that will attach that MMM to your model. Kubota, like other companies, tries to interchange parts.