X6 Sensor modules

Does anyone know the difference between MX-O-SMA-S-6D119 and MX-SM-D65-PW-6MP-F1.8 when using them on an x6 camera? Meaning: is there an advantage with the later SMA models? If so, what is the advantage? Also, are there later iterations of the SMA models? If so, what would be the differences?