What are the differences between the different kind of Alembic P-ups?

There are basically two types that Alembic use, Single Coils on Series Instruments,  and Humcancelling, which are not the same as humbucking, on Non-Series Instruments.
More detail is contained in this link here.
 
http://club.alembicguitars.net/Images/16271/18779.html?1117034562
 
I hope that gives you some clarity.
Jazzyvee