Ya, the car engines had the fiber gears and trucks had an alloy cam gear. They are interchangeable. The intent was more durability with the alloy gear but it was noisier. Not sure of the years the trucks used these gears.

I seem to think that the truck engines at some point used flat top pistons vs domed in the cars.

Many trucks had oil bath filters rather than the standard dry element but may have just been a recommended purchase.

Essentially they are identical and parts are interchangeable.