The turbo crank has rolled fillets and the non-turbo or N/A crank does not. If you do a search on this forum about this topic of the differences between the turbo motor and standard 3.8 V6 motor you will find the rest of the answers you are looking for or check out www.gnttype.org for more info.
I just did a search on "NA block" in the General Turbo Buick Tech section and found several threads that will give you all the info you need on the difference bewteen the turbo 3.8 and standard 3.8 V6 motors.
