+Daniel Dumitru The Smoothieboard v2 is much like the current Smoothieboard, but with the M4 instead of the M3, and with a smaller size.
The Smoothieboard v2 PRO is like the Smoothieboard v2, but with trinamic drivers, the FPGA, the edison port, more ports, a larger size, etc ...
I don't think you can use the LPC43xx as a drop-in replacement.