The answer is very similar to the thread you linked. First, recognize that the ML360R system consists of one pump and three fans that need electrical connections. For EACH of these four units, there is one cable for the pump or fan motor that ends in a common female (with holes) fan connector. Then each also has a separate cable ending in a wider 3-hole connector that looks like it had 4 holes but one is blocked off. That latter is for the ARGB lights in each unit.
Regarding the pump and fan motor cables, I fully expect the one from each of the fans is a 4-hole model, but the one from the pump has three holes. That is because it is using a quirk of the 3- and 4-pin fan systems to ensure that the pump always receives the full 12 VDC...