That is right, orignally 7.3 without turbo, and I think they add turbo in 1999, I can be wrong. Then they shrink to 6.0 then expanded to 6.4L. 2007 and later engine are required to use only ultra low sulfur Diesel. If using kerosene or heating oil whatever in 2007 or later will damage the engine. 2006 or earlier can take higher sulfur without damage.
There are almost no difference between diesel and Kerosene/heating oil. The difference is just highway tax are added to Diesel while no tax added heating oil/kerosene. Also, heating oil/kerosene got higher sulfur that is what will damage to 2007 or later diesel engine.