Thank you captain obvious, in other news, I thought I had done the C-45 Expeditor, from my Kansan, but I guess not.
Anywho, here's the Civilian Model 18 and the C-45:
Beechcraft Model 18:
Beechcraft C-45/UC-45/AT-7/JRB Expeditor/Navigator:
Edited to show actual differences between the civilian and military versions.