I've never encountered a "weak" block heater, either, but that doesn't prove it could never happen.
Two thoughts, is it possible they are from different sources and not the same wattage?
It would be easy to confirm a different Watt draw with an AC Ammeter or a Wattmeter, such as can be used to check appliance power draws when doing an efficiency audit.
Another thought is that the 4640 has a thermostat that isn't fully closing so the warmed water continuously circulates through the radiator and the block and heater never get as warm as the block and heater in the other tractor do.
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