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In the older models the 11441 and bigger had a heavier clutch.
Size of intercooler is probably different, different turbo, perhaps different injectors, smaller tires. Smaller tires can be swapped too but it too makes for the price difference of the 100 vs the 140.
Next to that you'll probably void warranty.
Have a 2013 ZetorForterra 135. It has given me nothing but hassle. The tractor has never worked properly. First issue was the dpf was blocked after about 50 -60 hours of operation. This was cleaned out by dealer, it lasted about 25 hours and failed again. Has been replaced with old system by dealer. After paying close on 4,000 euro extra for this day one it is not good enough. Have the tractor 9 months now and there has been nothing but trouble with it. The loader also has not worked properly comfort ride has never worked. Today tractor has failed to start yet again. I would advise staying well clear of zetor after this and I have always had one