Model numbers would help here.
Generally speaking, both units you mentioned run the same way. When they begin to operate, they draw enormous power to kick-start their compressors, then fall quickly to a fairly constant power draw. They cool the air until a thermostat is satisfied. The compressor then shuts off and the unit draws near zero power, waiting for another call to action.
Newer models have lots of energy saving doodads and custom controls built into them. They use less power to do the same thing as their predecessors did.
Regardless of the age or efficiency of the unit, changing the setpoint to a higher temperature will always make the unit run less. This in itself will save energy. If the unit is not actively cooling, it is not using much power.
You can get actual Kill-a-watt brand meters in 220 VAC flavor. I cannot remember the actual model number, but I found an equivalent knock-off on ebay quickly:
EU US AU UK France Energy Meter Watt Volt Voltage Electricity Monitor Analyzer | eBay