Modus Toolbox is built for IoT solution, which is an integrated platform supporting for development of both MCU and wireless products.
The subsequent PSoC 6 products will only be supported in Modus. However, PSoC Creator will not be obsolete, and Cypress will maintain both.
You can not develop the code for CY8CPROTO-062-4343W and then import it, as the ob-board CY8C62xA is not suppoted in PSoC Creator.
As for more details about the UDB availability, the following thread maybe helpful to you - How do I create a custom UDB solution in the Modus toolbox?