Some helpful soul posted a link to this US online shop a while back. Here's the exact link to their parts manual for the DF60/70 - albeit it was not downloading very successfully for me just now.
If it's like the DF90/115 one I'd previously downloaded, then it should give you a detailed clue on what the differences are. For example the camshaft is definitely one of the changes on the 90/115 engines.
Overall, though, I'd be amazed if you find this a realistic proposition.
I also ordered one of the Service Manuals - and was fully happy with both the product and delivery time.