2007 Nissan Maxima ABS Actuator Module

I have a 2007 Nissan Maxima SL that the ABS module has gone out. The part number in the vehicle is 47660 ZK40A; however, I keep finding part 47660 ZK41A listed as the correct part when searching online. Does anyone know the difference? Is the ZK41A and updated version of the ZK40A or is completely a different version?