Yes, the Gleaner E/EIII 226 engines had the same internals to the D17 226 tractor engines except for the different pistons that determined the different compression ratios. Combine manuals use tractor manual pages when it came to the engine. I don't know if that purported nitride treated crank from the Series IV D17 (SN 75001 and up starting in late 1964) was done for 170/175 or Later E/ EIII combine engines....
The Gleaner block was different as stated with the mechanical fuel pump mounting location.
Also, the Gleaner combine engines had basically single speed governors for combine use (rated speed & idle, nothing in between like the tractors). So if you get a combine engine to use in a tractor, you'll need a tractor governor for a tractor application.