If you go to gcp.se and look up the parts manuals, they are downloadable as pdf files when you click the link which says something like 'see paper copy'. These files are text searchable, and then you can cross-reference and compare part numbers from each.
Ages ago, I did a lot of this when I'd planned to convert my 780 to right-hand-drive, and found the part number for a LHD firewall from a 740 matched the part number for the 780 firewall, which were all built as LHD. So in theory, a RHD conversion could be done with a 780 using 740 components. The point being that different models share many components - some are obvious, but others you may think will be the same are in fact different.