In product specifications of bulldozers, the manufacturers give several figures for the engine power, such as flywheel power, net power - Net SAE J1349/ISO 9249, ISO 14396 power, and Gross SAE J1995 power.
What is the difference between them? Which is relevant and which one do you consider characteristic to represent the bulldozer's power (e.g. for comparison between two models)?
The engine specs of a Caterpillar D9 (the new model): https://www.cat.com/en_US/products/new/equipment/dozers/large-dozers/104260.html