According to diggerdata.com, your CL45 has a 40hp Shibaura diesel (obviously Japanese).
Here is something else I found:
"Shibaura was founded in 1950 as a joint venture between Toshiba and Ishikawajima Harima Industries (IHI). The company started with the manufacture of engines and garden tractors, and began building compact tractors in 1961. Shibaura built several models of compact tractors for Ford-New Holland."
So it may be possible that some of the Ford compact tractors share the same engine.
Hope this helps - SR