Having researched this a little I've found out that I need to change them from DS1 to DS0.
My original one says DS0 on the SMT jumper, the two new ones says DS1.
No, I've found a german site that says how to use them as DD drives, but I swear that the old one I have has worked in my A4000D without modifications, despite that it says that it's a 4000T drive (could be one that needs the adapter board).
The reason why I don't use it now is that it doesn't detect disk changes.