Can I swap out Yanmar diesel with another type/brand engine?

[56wrench]

When i was shopping for a small tractor, i was dealing on a JD and a Kubota both new. The Kubota in the same size with the same attachments came in about $7K cheaper

 

[Tyler d4c]

I can check with parts dept monday. I work at a Yanmar dealer in Central PA

Could you pm me where you work so I can add yins to my list of places to f8nd parts

 

[Bullitt]

Yanmar is asking for the engine identification tag on top of the valve cover. They said the block casting ID is not enough