As a rule of thumb the older Phase One backs use TSI (formerly Kodak) sensors and the newer Phase One backs use Dalsa sensors. There are some exceptions to that rule for some products introduced more than a decade ago.
Phase One Backs that use sensors from TSI (formerly Kodak)
H20, H25, P20, P21, P25, P30, P45, P20+, P21+, P25+, P30+, P45+
Phase One Backs that use sensors from Dalsa
P40+, P65+, IQ140, IQ160, IQ180
It would be impolite for me to comment more on a thread started regarding Hasselblad development (it would be hijacking the thread). If you're interested in more about the pros and cons of each kind of sensor or more history you're welcome to stop by the office or start a new thread.