So it seems the coil is split. Didn't look at the diagrams until now (dummy...)
If I wanted to use two similar humbuckers I'd have like 10 wires total (with bares) coming from pups alone. Don't know what I'd achieve with two soundwise - would look more well equipped at least. Plus could not split the coils but would have to use the blend to seperate the two pups. The coils would be all active one pup as a whole. Other pups would look kind of silly on a MM type bass.