Convert Simulink Model from Altera/Intel Dsp Builder to Xilinx/Amd System Generator

I have an old Cyclone III FPGA design for which some blocks are designed using DSP Builder blockset in simulink. As per the new requirement I am to convert this model for the Spartan 7 FPGA using Xilinx System Generator.

Is there a way or method to do this conversion automatically? Or do I have to do it manually?

BR Saumil

I am familiar with DSP Builder blockset and currently studying one to one block conversion to System Generator. Because I am not sure even if the equivalent blocks would give the same output (output type, latency, frequency, etc).