Maybe. They both use the same socket T but the motherboards have different chipsets so the sockets could be connected differently. Look on the Dell website and see if you can find a processor compatibility chart.
or better yet could i replace the motherboard in this one with a dell optiplex 745 mt motherboard? hopefully yes
Dell does proprietary things with their builds so check the motherboard mounting hole positions, back plane postioning, power connectors, and both functional and physical PSU compatibility.