The built-in motion function of the MX-F Model is programmed using motion control FB, wheareas the FX5-40/80SSC-G of the iQ-F series is programmed using buffer memory.
Also, the supported functions are different, and the Technical bulletin below describes the functional differences.

[Technical bulletin]
・Differences Between MELSEC iQ-F Series And MELSEC MX Controller MX-F Model<FAM-A-0102-A>