A dual key lock core and a key lock core assembly using the same are provided. The dual key lock core of the present invention includes a lock core rod, a driving rod, and an outer barrel. The lock core rod includes a wedging part and an inner barrel disposed at opposite ends. The inner barrel has a hollow guiding groove, an inner barrel protrusion, and a first lock structure. The driving rod is rotatably capped within the inner barrel. One end of the outer surface of the driving rod has a driving protrusion. The other end of the outer surface of the driving rod has a second lock structure. The driving protrusion is in and movable along the hollow guiding groove when the driving rod is capped within the inner barrel.