One other thought since you're looking at manuals and filters only for the moment.
On my MF1010, the engine serial number is stamped into the engine block, and it begins with "CS86".
Not certain, but my I&T shop manual covers the 1010 and the 1020, and it indicates the 1020 engine serial number is stamped in the same place. So look on the engine block just above the fuel filter and just below the injector pump, and see if there's a serial number there that starts with "CS112". You may have to wipe it off with a shop towel and put a strong light on it at an angle to get it visible. If you have that stamping, you've probably got exactly the same engine anyway.
Good luck.