Hi,
The model numbers MX-MPC3E-3D and MX-MPC3E-3D-R-B refer to identical hardware. The difference is in the license. The license operates on an honour system. Therefore, I believe that without the license, your configuration will work, but if/when it comes to obtaining support for that feature on that card, JTAC may refuse.
That's my understanding at least.
Regards,
Niall