If I'm not mistaken (I'm an amateur ww2 history reader) KstN 714 was supposed to be on armored APCs (ie Halftracks) compared to 712 which was designed to be on trucks. Though with halftracks being short on supply most of the war, I'm not sure how many of KstN 714 structures forced to rely on trucks.
Here are authorized equipment listings just in case:
http://www.niehorster.org/011_german...kstn_0712.html
http://www.niehorster.org/011_german...kstn_0714.html